Hebrews 5:9

Being made perfect. Gr. teleioo (see on eh. 2:10). The verb fonn may be translated “having been made perfect,” or “having been completed.” The thought is that of having attained a goal, of having finished a task. Christ achieved that which He had set out to accomplish through His humanity. He had demonstrated His obedience to the point of death, and was perfected. He was now qualified for the office of high priest (see on eh. 5:1-3).

Author. Gr. aitios, “cause,” “source.” It was the fulfillment of the plan laid before the foundation of the world with regard to His incarnation, life, death, resurrection, and glorification, that made Him the source of salvation. See Acts 4:12.

That obey him. Obedience is directly involved in the plan of salvation, not that salvation is earned by obedience, but that faith leads to obedience. For the relationship of works to faith see on Rom. 3:31.