At the end of four years, Absalom said to the king, "Let me go to Hebron and fulfill a vow I made to the LORD.
References for 2 Samuel 15:7
While your servant was living at Geshur1 in Aram, I made this vow:2 'If the LORD takes me back to Jerusalem, I will worship the LORD in Hebron. ' "
References for 2 Samuel 15:8
The king said to him, "Go in peace." So he went to Hebron.