“And being made perfect, he became the author of eternal salvation unto all them that obey him” (Hebrews 5:9).
Before his crucifixion, death and resurrection, Jesus expressed the fact that he would be perfected, as it is written:
“The same day there came certain of the Pharisees, saying unto him, ‘Get thee out, and depart hence: for Herod will kill thee.’
And he said unto them, ‘Go ye, and tell that fox, Behold, I cast out devils, and I do cures to day and to morrow, and the third day I shall be perfected’” (Luke 13:31-32).
JESUS: “Who, being in the form of God, thought it not robbery to be equal with God; but made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men. And being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross. Wherefore God also hath highly exalted him, and given him a name which is above every name. That at the name of Jesus every knee should bow, of things in heaven, and things in earth, and things under the earth; And that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father” (Philippians 2:5–11).
“That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. For the Scripture saith, whosoever believeth on him shall not be ashamed” (Romans 10:9–11).