2 Samuel 15:7-10

7At the end of four years, Absalom said to the king, “Let me go to Hebron and fulfill a vow I made to the Lord.

8While your servant was living at Geshur in Aram, I made this vow: ‘If the Lord takes me back to Jerusalem, I will worship the Lord in Hebron.’ ”

9The king said to him, “Go in peace.” So he went to Hebron.

10Then Absalom sent secret messengers throughout the tribes of Israel to say, “As soon as you hear the sound of the trumpets, then say, ‘Absalom is king in Hebron.’ ”