For as Jonas was three days and three nights in the whale's belly; so shall the Son of man be three days and three nights in the heart of the earth.

People's New Testament

12:40 As Jonah was three days and three nights in the whale's belly. See Jon 1:17. The great fish was probably not a whale (the Greek is ketos, sea monster ), but a white shark, which abounds in the Mediterranean, and is said to swallow a horse whole. The miracle was the preservation of the life of Jonah during his living burial. This was a type of the burial and resurrection of Christ.

So shall the Son of man be three days and three nights. Jesus says that he will be raised again the third day (Mt 16:21). Hence, in Jewish usage the third day must mean the same as three days and three nights. It was and is customary with the Orientals to make any part of the day stand for the whole twenty-four hours. Compare Mt 16:21 Mr 8:31 2Ch 10:5 10:12 Es 4:16 Ge 7:4,12 Ex 24:18 34:28:00 A traveler in the East writes:

At length the tenth morning arrived--the tenth morning because, though we performed nominally ten days quarantine, yet it was, really, only eight days. We landed at nine o'clock in the evening of the first day, and were liberated at six o'clock in the morning of the tenth day, but it was held to be ten days according to the custom of the East.''

Christ was buried Friday evening, lay in the grave Saturday, and rose Sunday, parts of three days, rose on the third day, and was in the grave the space of time meant in eastern usage by three days and three nights.

In the heart of the earth. In the sepulcher.

Wesley's Notes

12:40 Three days and three nights - It was customary with the eastern nations to reckon any part of a natural day of twenty - four hours, for the whole day. Accordingly they used to say a thing was done after three or seven days, if it was done on the third or seventh day, from that which was last mentioned. Instances of this may be seen, 1Kings 20:29; and in many other places. And as the Hebrews had no word to express a natural day, they used night and day, or day and night for it. So that to say a thing happened after three days and three nights, was with them the very same, as to say, it happened after three days, or on the third day. See Esther 4:16; 5:1; Gen 7:4,12; Exod 24:18; 34:28. Jonah 2:1.

Jamieson-Fausset-Brown Bible Commentary

40. For as Jonas was-"a sign unto the Ninevites, so shall also the Son of man be to this generation" (Lu 11:30). For as Jonas was

three days and three nights in the whale's belly-(Jon 1:17).

so shall the Son of man be three days and three nights in the heart of the earth-This was the second public announcement of His resurrection three days after His death. (For the first, see Joh 2:19). Jonah's case was analogous to this, as being a signal judgment of God; reversed in three days; and followed by a glorious mission to the Gentiles. The expression "in the heart of the earth," suggested by the expression of Jonah with respect to the sea (2:3, in the Septuagint), means simply the grave, but this considered as the most emphatic expression of real and total entombment. The period during which He was to lie in the grave is here expressed in round numbers, according to the Jewish way of speaking, which was to regard any part of a day, however small, included within a period of days, as a full day. (See 1Sa 30:12, 13; Es 4:16; 5:1; Mt 27:63, 64, &c.).

Matthew Henry's Concise Commentary

12:38-45 Though Christ is always ready to hear and answer holy desires and prayers, yet those who ask amiss, ask and have not. Signs were granted to those who desired them to confirm their faith, as Abraham and Gideon; but denied to those who demanded them to excuse their unbelief. The resurrection of Christ from the dead by his own power, called here the sign of the prophet Jonah, was the great proof of Christ's being the Messiah. As Jonah was three days and three nights in the whale, and then came out again alive, thus Christ would be so long in the grave, and then rise again. The Ninevites would shame the Jews for not repenting; the queen of Sheba, for not believing in Christ. And we have no such cares to hinder us, we come not to Christ upon such uncertainties. This parable represents the case of the Jewish church and nation. It is also applicable to all those who hear the word of God, and are in part reformed, but not truly converted. The unclean spirit leaves for a time, but when he returns, he finds Christ is not there to shut him out; the heart is swept by outward reformation, but garnished by preparation to comply with evil suggestions, and the man becomes a more decided enemy of the truth. Every heart is the residence of unclean spirits, except those which are temples of the Holy Ghost, by faith in Christ.