Taking possession of the harem was the most decided act of sovereignty (see 1 Kings 2:22). It was also the greatest offence and insult that could be offered. Such an act on Absalom’s part made reconciliation impossible. A further motive has been found in this advice, namely, the desire on the part of Ahithophel to make David taste the bitterness of that cup which he had caused others (Uriah and all Bath-sheba’s family) to drink, and receive the measure which he had meted withal.
Related Commentaries of 2 Samuel 16:21
2 Samuel 16:21
21 And Ahithophel said unto Absalom, Go in unto thy father's concubines, which he hath left to keep the house; and all Israel shall hear that thou art abhorred of thy father: then shall the hands of all that are with thee be strong.