Bible Verses About The High Priest: Being made without an oath

What is more, God swore an oath. For no oath was sworn in connection with those who become cohanim now;

but Yeshua became a cohen by the oath which God swore when he said to him, “Adonai has sworn and will not change his mind, ‘You are a cohen forever.’”

Also this shows how much better is the covenant of which Yeshua has become guarantor.