2 Samuel 20:4-6

4Now the king said to Amasa [the commander of his army], “Summon the [fighting] men of Judah to me within three days, and be present here yourself.”

5So Amasa went to summon [the fighting men of] Judah, but he delayed longer than the time which David had set for him.

6And David said to Abishai [his nephew], “Now Sheba the son of Bichri will do us more harm than Absalom did. Take your lord’s servants and pursue him, so that he does not find fortified cities for himself and escape from our sight.”