And they said every one to his fellow, Come, and let us cast {i} lots, that we may know for whose cause this evil is upon us. So they cast lots, and the lot fell upon Jonah.

(i) Which declares that the matter was very extreme and in doubt, which was God's way of getting them to test for the cause: and this may not be done except in matters of great importance.

Wesley's Notes

1:7 Cast lots - Lots are an appeal to heaven in doubtful cases, and therefore not to be used but where the matter is undeterminable in any other way.

Jamieson-Fausset-Brown Bible Commentary

7. cast lots-God sometimes sanctioned this mode of deciding in difficult cases. Compare the similar instance of Achan, whose guilt involved Israel in suffering, until God revealed the offender, probably by the casting of lots (Pr 16:33; Ac 1:26). Primitive tradition and natural conscience led even the heathen to believe that one guilty man involves all his associates, though innocent, in punishment. So Cicero [The Nature of the Gods, 3.37] mentions that the mariners sailing with Diagoras, an atheist, attributed a storm that overtook them to his presence in the ship (compare Horace's Odes, 3.2.26).

Matthew Henry's Concise Commentary

1:4-7 God sent a pursuer after Jonah, even a mighty tempest. Sin brings storms and tempests into the soul, into the family, into churches and nations; it is a disquieting, disturbing thing. Having called upon their gods for help, the sailors did what they could to help themselves. Oh that men would be thus wise for their souls, and would be willing to part with that wealth, pleasure, and honour, which they cannot keep without making shipwreck of faith and a good conscience, and ruining their souls for ever! Jonah was fast asleep. Sin is stupifying, and we are to take heed lest at any time our hearts are hardened by the deceitfulness of it. What do men mean by sleeping on in sin, when the word of God and the convictions of their own consciences, warn them to arise and call on the Lord, if they would escape everlasting misery? Should not we warn each other to awake, to arise, to call upon our God, if so be he will deliver us? The sailors concluded the storm was a messenger of Divine justice sent to some one in that ship. Whatever evil is upon us at any time, there is a cause for it; and each must pray, Lord, show me wherefore thou contendest with me. The lot fell upon Jonah. God has many ways of bringing to light hidden sins and sinners, and making manifest that folly which was thought to be hid from the eyes of all living.