Hebrews 5:9-11

Revised Standard Version Catholic Edition

⁹ and being made perfect he became the source of eternal salvation to all who obey him, ¹⁰ being designated by God a high priest after the order of Melchiz′edek.

Warning against Falling Away

¹¹ About this we have much to say which is hard to explain, since you have become dull of hearing.