2 Samuel 15:7 in the King James Version
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.
Context
6 Absalom did this sort of thing to all Israel who came to the king for judgment. So Absalom stole the hearts of the men of Israel.
7 At the end of forty years, Absalom said to the king, “Please let me go and pay my vow, which I have vowed to the LORD, in Hebron.
8 For your servant vowed a vow while I stayed at Geshur in Syria, saying, ‘If the LORD shall indeed bring me again to Jerusalem, then I will serve the LORD.’”