2 Samuel 15:8

⁶  And on this manner did Absalom to all Israel that came to the king for judgment: so Absalom stole the hearts of the men of Israel.

⁷  And it came to pass after forty years, that Absalom said unto the king, I pray thee, let me go and pay my vow, which I have vowed unto the LORD, in Hebron.

⁸  For thy servant vowed a vow while I abode at Geshur in Syria, saying, If the LORD shall bring me again indeed to Jerusalem, then I will serve the LORD.

⁹  And the king said unto him, Go in peace. So he arose, and went to Hebron.

¹⁰  But Absalom sent spies throughout all the tribes of Israel, saying, As soon as ye hear the sound of the trumpet, then ye shall say, Absalom reigneth in Hebron.