but he with an oath, through the one who said to him: “The Lord has sworn, and he will not repent: ‘You are a priest forever’”— to that same degree has Jesus [also] become the guarantee of an [even] better covenant. Those priests were many because they were prevented by death from remaining in office, but he, because he remains forever, has a priesthood that does not pass away. Therefore, he is always able to save those who approach God through him, since he lives forever to make intercession for them. It was fitting that we should have such a high priest: holy, innocent, undefiled, separated from sinners, higher than the heavens. He has no need, as did the high priests, to offer sacrifice day after day, first for his own sins and then for those of the people; he did that once for all when he offered himself. For the law appoints men subject to weakness to be high priests, but the word of the oath, which was taken after the law, appoints a son, who has been made perfect forever.
Hebrews 7:21-28 NABRE
No one takes this honor upon himself but only when called by God, just as Aaron was. In the same way, it was not Christ who glorified himself in becoming high priest, but rather the one who said to him: “You are my son; this day I have begotten you”; just as he says in another place: “You are a priest forever according to the order of Melchizedek.” In the days when he was in the flesh, he offered prayers and supplications with loud cries and tears to the one who was able to save him from death, and he was heard because of his reverence. Son though he was, he learned obedience from what he suffered; and when he was made perfect, he became the source of eternal salvation for all who obey him, declared by God high priest according to the order of Melchizedek. Exhortation to Spiritual Renewal.
Hebrews 5:4-10 NABRE
If for this life only we have hoped in Christ, we are the most pitiable people of all. Christ the Firstfruits. But now Christ has been raised from the dead, the firstfruits of those who have fallen asleep. For since death came through a human being, the resurrection of the dead came also through a human being. For just as in Adam all die, so too in Christ shall all be brought to life, but each one in proper order: Christ the firstfruits; then, at his coming, those who belong to Christ; then comes the end, when he hands over the kingdom to his God and Father, when he has destroyed every sovereignty and every authority and power. For he must reign until he has put all his enemies under his feet. The last enemy to be destroyed is death, for “he subjected everything under his feet.” But when it says that everything has been subjected, it is clear that it excludes the one who subjected everything to him. When everything is subjected to him, then the Son himself will [also] be subjected to the one who subjected everything to him, so that God may be all in all.
1 Corinthians 15:19-28 NABRE
Have among yourselves the same attitude that is also yours in Christ Jesus, Who, though he was in the form of God, did not regard equality with God something to be grasped. Rather, he emptied himself, taking the form of a slave, coming in human likeness; and found human in appearance, he humbled himself, becoming obedient to death, even death on a cross. Because of this, God greatly exalted him and bestowed on him the name that is above every name, that at the name of Jesus every knee should bend, of those in heaven and on earth and under the earth, and every tongue confess that Jesus Christ is Lord, to the glory of God the Father. Obedience and Service in the World.
Philippians 2:5-11