Hebrews 7:21
but he with an oath, because of him who says to him, The Lord swore and will not change his mind, Thou are a priest into the age according to the order of Melchizedek.
Psalm 110:4
LORD has sworn, and will not repent. Thou are a priest forever after the order of Melchizedek.
Hebrews 7:17
For he testifies, Thou are a priest into the age according to the order of Melchizedek.
1 Samuel 15:29
And also the Strength of Israel will not lie nor repent, for he is not a man that he should repent.
Hebrews 6:16-18
For men certainly swear by the greater, and of every dispute with them the oath is final for confirmation.