Psalms 110:4 - The LORD hath sworn, and will not repent, Thou art a priest for ever after the order of Melchizedek.   (Verses like Psalms 110:4)

Hebrews 7:17 - For he testifieth, Thou art a priest for ever after the order of Melchisedec.   (Verses like Hebrews 7:17)

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.   (Verses like 1 Samuel 15:29)

Hebrews 6:16-18 - For men verily swear by the greater: and an oath for confirmation is to them an end of all strife.Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath:That by two immutable things, in which it was impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us:   (Verses like Hebrews 6:16)