Q. 1. In Hebrews 5:5-11, there are two references to Jesus being appointed to the "Order of Melchizedek." What is the "Order of Melchizedek?" I never heard of it before.
"So also Christ did not glorify himself in becoming a high priest, but was appointed by the one who said to him, 'You are my Son, today I have begotten you'; as he says also in another place, 'You are a priest forever, according to the order of Melchizedek.' In the days of his flesh, Jesus offered up 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 reverent submission. Although he was a Son, he learned obedience through what he suffered; and having been made perfect, he became the source of eternal salvation for all who obey him, having been designated by God a high priest according to the order of Melchizedek." [Hebrews 5:5-11]
A. 1. Reference to Melchizedek is found in the Old Testament in Genesis 14:17-20 where it states:
"After his return from the defeat of Chedorlaomer and the kings who were with him, the king of Sodom went out to meet him at the Valley of Shaveh (that is, the King’s Valley). And King Melchizedek of Salem brought out bread and wine; he was priest of God Most High. He blessed him and said, 'Blessed be Abram by God Most High, maker of heaven and earth; and blessed be God Most High, who has delivered your enemies into your hand!' And Abram gave him one-tenth of everything." [Genesis 14:17-20]
Melchizedek (the name meaning "my king is righteousness") was the king and priest mentioned in the above reference. Melchizedek was not from the hereditary priestly line of Levi. Not only was he a High Priest, he was also the King of Salem (meaning "peace").
In Christianity, based on the above passage in the Letter to the Hebrews, Jesus Christ was identified as a Priest forever in the Order of Melchizedek, and so Jesus assumes the role of High Priest once and for all.
When reference is made to the "Order of Melchizedek," it indicates that Jesus was not only a priest or a King, He was the final High Priest and King of the highest rank, a rank that equalled that of the days of Melchizedek.