Moreover, Ahithophel said unto Absalom
Either at the same time, or quickly after he had given the foregoing advice:
let me now choose out twelve thousand men:
out of those that were with Absalom, which shows their number to be large; and twelve thousand are pitched upon with respect to the twelve tribes of Israel, a thousand from every tribe; Josephus has only ten thousand;
and I will arise and pursue after David this
he took upon him to be general of the army, as well as a counsellor; or this he said to show how confident he was of the success of his counsel, that if Absalom, or any other, should decline the conduct of the army upon it, as a hazardous attempt, he would undertake it himself; or rather it may be, he was not willing that Absalom should go out in person with the army, not so much for his own safety, as lest through his affection for the king he should spare him, when he fell into his hands, or they two should be reconciled; he proposed to do it that night, partly for expedition, no time being to be lost, and partly for the greater surprise of David and his men.