2 Samuel 15:7-10

7When four years had passed, Absalom said to the king, “Please let me go to Hebron to fulfill a vow I made to the Lord.

8For your servant made a vow when I lived in Geshur of Aram, saying, ‘If the Lord really brings me back to Jerusalem, I will worship the Lord in Hebron.’”

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

10Then Absalom sent agents throughout the tribes of Israel with this message: “When you hear the sound of the ram’s horn, you are to say, ‘Absalom has become king in Hebron!’”