2 Samuel 15:7-10

7Four years later Absalom said to the king, “Let me go to Hebron and keep the vow I made to the Lord.

8I made a vow while I was living at Geshur in Aram. I said, ‘If the Lord will bring me back to Jerusalem, I will serve the Lord.’ ”

9“Go in peace,” the king told him. So he went to Hebron.

10But Absalom sent his loyal supporters to all the tribes of Israel and said, “When you hear the sound of the ram’s horn, say, ‘Absalom has become king in Hebron.’ ”