It was told Joab, ‘The king is weeping and mourning for Absalom.’ So the victory that day was turned into mourning for all the troops; for the troops heard that day, ‘The king is grieving for his son.’ (vs 1-2)
The king was deeply moved, and went up to the chamber over the gate, and wept; and as he went, he said, ‘O my son Absalom, my son, my son Absalom! Would that I had died instead of you, O Absalom, my son, my son!’ (v.33)