2 Samuel 15:6-10

Absalom dealt this way with all Israel who came to the king for judgment; so Absalom stole the hearts of the people of Israel.

Now it came about at the end of four years that Absalom said to the king, “Please let me go and pay my vow which I have made to the Lord, in Hebron.

For your servant made a vow while I was living in Geshur in Aram, saying, ‘If the Lord will indeed bring me back to Jerusalem, then I will serve the Lord.’ ”

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

But Absalom sent spies throughout the tribes of Israel, saying, “As soon as you hear the sound of the trumpet, then you shall say, ‘Absalom is king in Hebron!’ ”