Biblical Significance of 40 Days and 40 Nights
The biblical phrase "forty days and forty nights" frequently appears in scripture, often signifying a period of testing, judgment, or divine preparation [8, 12]. This duration is not merely a literal count but carries symbolic weight throughout both the Old and New Testaments.
One of the earliest occurrences is during the Great Flood, where "it rained on the earth forty days and forty nights" [1]. This period led to the destruction of the world, establishing a connection between the number forty and divine judgment or cleansing [12].
Moses's experiences on Mount Sinai repeatedly involve this duration. He ascended the mountain and remained there for forty days and forty nights on two separate occasions, neither eating nor drinking, while receiving the Law from God [8, 13]. This fast is seen as a period of intense divine sustenance and preparation, paralleling Jesus's later fast [8].
The Israelites' wilderness wandering, a period of trial and testing, lasted forty years [9]. This extended period of wandering is often linked to the forty-day motif, with some interpretations suggesting a "year-day" theory where each day represents a year [3, 10]. The prophet Ezekiel, for instance, was instructed to lie on his side for 390 days for Israel and 40 days for Judah, symbolizing years of punishment [10]. Similarly, the prophet Jeremiah mentions a period of forty years for Egypt's desolation [12].
In the New Testament, Jesus's temptation in the wilderness lasted "forty days and forty nights" [9]. During this time, he was tempted by the devil [11]. This event is understood as a period of testing and preparation for his ministry, drawing parallels to Moses's fast and Israel's wilderness experience [8, 9]. The duration of forty days also marks the period between Jesus's resurrection and his ascension, during which he appeared to his disciples and taught them about the kingdom of God (Acts 1:3).
While "forty days and forty nights" often denotes a significant period, other numerical durations also hold symbolic meaning. For example, the "three days and three nights" that Jonah spent in the belly of the great fish is explicitly linked by Jesus to his own time in the "heart of the earth" [2]. Similarly, Joseph interpreted a dream where "three baskets are three days" [4]. The Feast of Pentecost, meaning "fiftieth," is celebrated on the fiftieth day after the Passover, following seven complete weeks (49 days) [5, 6]. This feast marked the harvest and the giving of the Law at Sinai, further connecting specific numerical periods to divine events and agricultural cycles [5].
The concept of "night" itself is described as the period of darkness from sunset to sunrise, established by God and belonging to Him [7]. The consistent use of "forty days and forty nights" across various biblical narratives underscores its significance as a divinely appointed period for purification, judgment, testing, or preparation, rather than merely a literal measurement of time [12].
Sources
- Genesis “It rained on the earth forty days and forty nights. -- Genesis 7:12”
- Matthew “For as Jonah was three days and three nights in the belly of the whale, so will the Son of Man be three days and three nights in the heart of the earth. -- Matthew 12:40”
- Easton's Bible Dictionary “Easton's Bible Dictionary: Seventy weeks — A prophetic period mentioned in Dan. 9:24, and usually interpreted on the "year-day" theory, i.e., reckoning each day for a year. This period will thus represent 490 years. This is regarded as the period which would elapse till the time of the coming of the Messiah, dating "from the going forth of the commandment to restore and rebuild Jerusalem" i.e., from the close of the Captivity.”
- Genesis “Joseph answered, “This is its interpretation. The three baskets are three days. -- Genesis 40:18”
- Smith's Bible Dictionary “Smith's Bible Dictionary: Pentecost — that is, the fiftieth day (from a Greek word meaning fiftieth), or Harvest Feast, or Feast of Weeks, may be regarded as a supplement to the Passover. It lasted for but one day. From the sixteenth of Nisan seven weeks were reckoned inclusively, and the next or fiftieth day was the day of Pentecost, which fell on the sixth of Sivan (about the end of May). (Exodus 23:16; 34:22; Leviticus 23:15,22; Numbers 28) See Jewish calendar at the end of this volume. The Pentecost was the Jewish harvest-home, and the people were especially exhorted to rejoice before Jeho”
- Easton's Bible Dictionary “Easton's Bible Dictionary: Pentecost — I.e., "fiftieth", found only in the New Testament (Acts 2:1; 20:16; 1 Cor. 16:8). The festival so named is first spoken of in Ex. 23:16 as "the feast of harvest," and again in Ex. 34:22 as "the day of the firstfruits" (Num. 28:26). From the sixteenth of the month of Nisan (the second day of the Passover), seven complete weeks, i.e., forty-nine days, were to be reckoned, and this feast was held on the fiftieth day. The manner in which it was to be kept is described in Lev. 23:15-19; Num. 28:27-29. Besides the sacrifices prescribed for the occasion, every o”
- Torrey's Topical Textbook “Torrey's Topical Textbook: Night — The darkness first called -- Ge 1:5. Caused by God -- Ps 104:20. Belongs to God -- Ps 74:16. The heavenly bodies designed to separate day from -- Ge 1:14. The moon and stars designed to rule and give light by -- Ge 1:16-18; Jer 31:35. Commenced at sunset -- Ge 28:11. Continued until sunrise -- Ps 104:22; Mt 28:1; Mr 16:2. Regular succession of Established by covenant. -- Ge 8:22; Jer 33:20. Ordained for the glory of God. -- Ps 19:2. Originally divided into three watches -- La 2:19; Jdj 7:19; Ex 14:24. Divided into four watches by the Romans -- Lu 12:38; Mt 14”
- Deuteronomy (Protestant academic) “Tyndale House on Deuteronomy 9:9: 9:9 Covenant here refers to the promises God made with Israel nearly forty years earlier at Sinai (see 4:13). • The common biblical expression forty days and forty nights represents trial or testing (Exod 34:28). Moses’ fast was like Jesus’ fast (Matt 4:2). It is physically possible to go without food for forty days, but a person cannot ordinarily survive without water for more than a few days. Moses was directly sustained by God (cp. Matt 4:11).”
- Matthew (Protestant academic) “Tyndale House on Matthew 4:2: 4:2 forty days and forty nights (see Exod 24:18; 34:28; 1 Kgs 19:8): Israel was tested in the wilderness for forty years (Exod 16:35; Deut 1:3).”
- Ezekiel (Presbyterian) “Jamieson, Fausset & Brown on Ezekiel 4:5: three hundred and ninety days--The three hundred ninety years of punishment appointed for Israel, and forty for Judah, cannot refer to the siege of Jerusalem. That siege is referred to in Eze 4:1-3, and in a sense restricted to the literal siege, but comprehending the whole train of punishment to be inflicted for their sin; therefore we read here merely of its sore pressure, not of its result. The sum of three hundred ninety and forty years is four hundred thirty, a period famous in the history of the covenant-people, being that of their sojourn in Egy”
- Luke (Baptist/Reformed) “John Gill on Luke 4:2: Being forty days tempted of the devil,.... The Vulgate Latin, Syriac, Persic, and Ethiopic versions read the phrase, "forty days", in connection with the latter part of the preceding verse; according to which the sense is, that Jesus was led by the Spirit forty days in the wilderness, before he was tempted by Satan, and in order to it: but our reading is confirmed by Mar 1:13 who affirms, as here, that he was so long tempted by Satan; as he might be invisibly, and, by internal suggestions, before he appeared visibly, and attacked him openly, with the following temptation”
- Ezekiel (Presbyterian) “Jamieson, Fausset & Brown on Ezekiel 29:11: forty years--answering to the forty years in which the Israelites, their former bondsmen, wandered in "the wilderness" (compare Note, see on Eze 29:5). JEROME remarks the number forty is one often connected with affliction and judgment. The rains of the flood in forty days brought destruction on the world. Moses, Elias, and the Saviour fasted forty days. The interval between Egypt's overthrow by Nebuchadnezzar and the deliverance by Cyrus, was about forty years. The ideal forty years' wilderness state of social and political degradation, rather than ”
- Sefaria (Jewish (Rationalist)) “Abraham Ibn Ezra on Exodus 24:11: AND DRINK. In happiness. Rabbi Judah Ha-Levi says that the meaning of and did eat is, they had to eat even though they enjoyed the splendor of God’s presence. Scripture mentions this because Moses lived for forty days and forty nights without eating and drinking, as is noted in the next section. 36 Verse 18. Actually verse 18 only tells us that Moses was on Mount Sinai for 40 days. However, Deut. 9:9 tells us that Moses did not eat or drink during those forty days.”