Hebrews 7:21
(for those priests were made without an oath, but this one was made with an oath by Him who said to Him, "The Lord swore and will not repent, You are a priest forever after the order of Melchizedek,")
Psalm 110:4
Jehovah has sworn, and will not repent, You are a priest forever after the order of Melchizedek.
Hebrews 7:17
For He testifies, "You are a priest forever after the order of Melchizedek."
1 Samuel 15:29
And also the Glory of Israel will not lie nor repent, for He is not a man that He should repent.
Hebrews 6:16-18
For men truly swear by the greater, and an oath for confirmation is to them an end of all strife.