Hebrews 7:20-28

And he confirmed it to us with his solemn vow. For the former priests took their office without an oath, but with Jesus, God affirmed his royal-priesthood with his promise, saying, The Lord has made a solemn oath and will never change his mind, “You are a King-Priest forever!” So all of this magnifies the truth that we have a superior covenant with God than what they experienced, for Jesus himself is its guarantor! As additional proof, we know there were many priests under the old system, for they eventually died and their office had to be filled by another. But Jesus permanently holds his priestly office, since he lives forever and will never have a successor! So he is able to save fully from now throughout eternity, everyone who comes to God through him, because he lives to pray continually for them. He is the High Priest who perfectly fits our need—holy, without a trace of evil, without the ability to deceive, incapable of sin, and exalted beyond the heavens! Unlike the former high priests, he is not compelled to offer daily sacrifices. They had to bring a sacrifice first for their own sins, then for the sins of the people, but he finished the sacrificial system, once and for all, when he offered himself. The law appointed flawed men as high priests, but God’s promise, sealed with his oath, which succeeded the law, appoints a perfect Son who is complete forever!