NET
7 After four years Absalom said to the king, “Let me go and repay my vow that I made to the Lord while I was in Hebron.
Darby
7 And it came to pass at the end of forty years, that Absalom said to the king, I pray thee, let me go and pay in Hebron my vow which I have vowed to Jehovah.
KJV
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.