Old Testament

The Book of Leviticus: Chapter 24:1-5-10-12

Then the Lord spoke to Moses, saying: "Command the children of Israel that they bring to you pure oil of pressed olives for the light, to make the lamps burn continually. Outside the veil of the Testimony, in the tabernacle of meeting, Aaron shall be in charge of it from evening until morning before the Lord continually; it shall be a statute forever in your generations. He shall be in charge of the lamps on the pure gold lampstand before the Lord continually.

"And you shall take fine flour and bake twelve cakes with it. Two-tenths of an ephah shall be in each cake. You shall set them in two rows, six in a row, on the pure gold table before the Lord. And you shall put pure frankincense on each row, that it may be on the bread for a memorial, an offering made by fire to the Lord.
8 Every Sabbath he shall set it in order before the Lord continually, being taken from the children of Israel by an everlasting covenant. And it shall be for Aaron and his sons, and they shall eat it in a holy place; for it is most holy to him from the offerings of the Lord made by fire, by a perpetual statute."

Now the son of an Israelite woman, whose father was an Egyptian, went out among the children of Israel; and this Israelite woman's son and a man of Israel fought each other in the camp. And the Israelite woman's son blasphemed the name of the Lord and cursed; and so they brought him to Moses. (His mother's name was Shelomith the daughter of Dibri, of the tribe of Dan.) Then they put him in custody, that the mind of the Lord might be shown to them.

New Testament

The Epistle to the Hebrews: Chapter 5:1-5-11-14

For every high priest taken from among men is appointed for men in things pertaining to God, that he may offer both gifts and sacrifices for sins. He can have compassion on those who are ignorant and going astray, since he himself is also subject to weakness. Because of this he is required as for the people, so also for himself, to offer sacrifices for sins. And no man takes this honor to himself, but he who is called by God, just as Aaron was.

So also Christ did not glorify Himself to become High Priest, but it was He who said to Him:

"You are My Son,
Today I have begotten You."

As He also says in another place:

"You are a priest forever
According to the order of Melchizedek";

who, in the days of His flesh, when He had offered up prayers and supplications, with vehement cries and tears to Him who was able to save Him from death, and was heard because of His godly fear, though He was a Son, yet He learned obedience by the things which He suffered. And having been perfected, He became the author of eternal salvation to all who obey Him, called by God as High Priest "according to the order of Melchizedek," of whom we have much to say, and hard to explain, since you have become dull of hearing.

For though by this time you ought to be teachers, you need someone to teach you again the first principles of the oracles of God; and you have come to need milk and not solid food. For everyone who partakes only of milk is unskilled in the word of righteousness, for he is a babe. But solid food belongs to those who are of full age, that is, those who by reason of use have their senses exercised to discern both good and evil.