Verse 7: "Who in the days of His flesh, offered up both prayers and supplications with loud crying and tears to the One who is able to be saving Him from death, and He was heard because of His piety,
Yes, He qualifies as a priest because He has felt the full weight of testing. This is probably a reference to the Garden of Gethsemane. Jesus Christ our Priest settled every claim against us, paid the fine in full, and shed His own blood as a sacrifice for our broken law.
"Who in the days of His flesh, offered up both prayers and supplications." Back in verse 1 we had the priests of Aaron's line "offering both gifts and sacrifices for sins." But our Great High Priest, the Lord Jesus, only "offered up both prayers and supplications." He never needed to offer a sacrifice for Himself for man's sin.
"Who in the days of His flesh, offered up both prayers and supplications with loud crying and tears to the One who is able to be saving Him from death, and He was heard because of His piety;" - that" is "By reason of His reverent submission," according to Henry Alford.
"He was heard because of His piety." The answer is given on resurrection morning when Jesus Christ breaks the bands of death and rises in new life.
In the Garden of Gethsemane it was: "Not my will, but Yours be done."
Ron Mehl said: "You can call heaven's help line anytime, seven days a week, twenty-four hours a day, and you'll never get some nasal-voiced, part-time angel or God's voice mail. This is a God who works the switchboard Himself. Even on the night shift." (God Works the Night Shift, 167)
verse 8: "although being a Son, He learned obedience from the things which He suffered;"
"Although being a Son" takes us back to the statement in verse 5, "You are my Son."
"He learned obedience." He did not learn to obey. That was not the issue. He was learning what is involved in obedience through suffering and testing - what it costs.
Dr. John G. Mitchell said: "To give thanks when you don't feel like it is not hypocrisy; it's obedience." (Ruth Myers, 31 Days of Praise, 26-27)