2 Samuel 24:15

So the Lord sent a pestilence upon Israel The event immediately answered to the choice; a plague instantly ensued. From the morning even to the time appointed From that morning, in which Gad came to David, to the third day, the time appointed by God for the continuance of the plague. But not to the conclusion of that day, for we learn from the next verse that God, moved by the repentance of the king and his subjects, commanded the destroying angel to stay his hand, which plainly indicates that he had not fully accomplished the commission at first given him. There died of the people seventy thousand “A calamity,” says Delaney, “which has no parallel in the whole compass of history.” It seems that the Hebrew nation were not only guilty, at this time, of many other sins, but were very culpable in regard to the numbering of the people, as well as David. They gloried, it is probable, in, and relied upon their numbers, and their own strength, instead of trusting in God and in his promises, for protection against, and victory over their enemies. And, therefore, it was with reason that they fell in this sad manner, to show them that all flesh is grass, and that their own strength and numbers availed nothing without God.