Hebrews 5:9

This experience perfected Jesus Christ in the sense that it completed Him by giving Him experiential knowledge of what human beings must endure. Obeying God means trusting Him (cf. John 6:29; Acts 6:7; Romans 10:16; 1 Peter 1:22). Jesus is, of course, the source of eternal, not just temporal, salvation to all who initially believe on Him. However, in view of the writer’s emphasis, it may be that he was also referring here to the ultimate aspect of our salvation, our eternal inheritance (Hebrews 1:14; Hebrews 9:15). We obtain this to the extent that we "obey" God, and obey Him through suffering as Jesus did (cf. Mark 8:34-35). [Note: Cf. Dillow, p. 132.] A major reason that early Jewish Christians suffered was because they chose to follow Christ. Likewise today all Christians face temptation to play down our commitment to Christ in the face of persecution of various kinds. Jesus Christ is the source (cause) of our inheritance not only because it comes from Him, but also because as our file leader He has blazed a trail through suffering for us (Hebrews 2:10). He is also the source of our inheritance because as our High Priest He provides what we need to live obediently to God.

"It is a nice touch that he who learned to obey brought salvation to those who obey." [Note: Morris, p. 50.]