Hebrews 7:21

7:21 but Jesus did so with a sworn affirmation by the one who said to him, “The Lord has sworn and will not change his mind, ‘You are a priest forever’” –

Hebrews 4:3

4:3 For we who have believed enter that rest, as he has said, “As I swore in my anger, ‘They will never enter my rest!’” And yet God’s works were accomplished from the foundation of the world.