Three days and three nights
The "three days and three nights" mentioned in Matthew 12:40 have confused some people because of the supposed differences between how long Christ said He would be in the tomb as it relates to the amount of time between His burial and resurrection that are recorded in the Bible.
Some people have declared that if we are to accept all of the teachings of the Bible, we must believe that Jesus was in the grave exactly three days and three nights-or a full 72 hours of time. They say this is the main proof of Jesus' divinity and Messiahship.
These say that proof of the Messiahship of Jesus is made to depend more upon the length of time Jesus was in the tomb rather than upon the all-important fact of His resurrection.
The meaning of Matthew 12:40
A careful study of the context of Matthew 12:40 will show that the central thought and meaning of the Bible text is Jesus' reproof of the unbelief of His critics. The length of time Jesus stayed in the tomb could not possibly be "the only supernatural proof" of His Messiahship.
The Bible plainly teaches that the proof of Jesus' divine status and mission was His resurrection. The importance of Christ's resurrection is clearly stated by Paul who wrote that Christ was "declared to be the Son of God with power, according to the Spirit of holiness, by the resurrection from the dead" (Romans 1:4). Jesus' resurrection is the evidence of His Sonship. (See also Acts 13:30-37; 1 Corinthians 15:19-22; Romans 4:24, 25.)
The great emphasis in the Scriptures is on the fact of Christ's resurrection, not upon the time He spent in the tomb.
Agreement?
The facts regarding the death, burial, and resurrection of Jesus, studied in the light of Jewish custom and idiomatic speech, are in complete agreement with Matthew 12:40.
Any attempt to change the crucifixion day from Friday to Wednesday and the resurrection day from Sunday to Saturday is wresting or twisting, the Scriptures. However, in the study of this problem, we should always bear in mind that the important fact which should engage our study is not the time which Jesus spent in the tomb, but rather the great fact of His resurrection, which made possible His mediation in our behalf, as well as the assurance of our resurrection and redemption.