Then it was reported to Joab, "The king is weeping and mourning over Absalom."

2 Samuel 18:5
Now the king had commanded Joab, Abishai, and Ittai, "Treat the young man Absalom gently for my sake." And all the people heard the king's orders to each of the commanders regarding Absalom.

2 Samuel 18:14
But Joab declared, "I am not going to wait like this with you!" And he took three spears in his hand and thrust them through the heart of Absalom while he was still alive in the oak tree.

2 Samuel 19:2
And that day's victory was turned into mourning for all the people, because on that day they were told, "The king is grieving over his son."

Zechariah 12:10
Then I will pour out on the house of David and on the people of Jerusalem a spirit of grace and prayer, and they will look on Me, the One they have pierced. They will mourn for Him as one mourns for an only child, and grieve bitterly for Him as one grieves for a firstborn son.

And it was told Joab, Behold, the king weeps and mourns for Absalom.