21 (for those priests were made such without an oath, but this one with an oath, by him that said to him, The Lord swore, and will not repent, Thou art a priest forever after the order of Melchisedec;)
Hebrews 7:21 Cross References - Anderson
Hebrews 6:16-18
16 For, verily, men swear by the greater, and an oath for confirmation is to them an end of all contradiction.
17 Wherefore, God, being more abundantly willing to show to the heirs of his promise the immutability of his purpose, inter posed an oath,
18 that by two immutable things, in which it was impossible for God to lie, we might have strong consolation, who have fled to lay hold on the hope set before us;
Hebrews 7:17
17 Thou art a priest forever after the order of Melchisedec.