"So you shall observe the Feast of Unleavened Bread, for on this same day I will have brought your armies out of the land of Egypt. Therefore you shall observe this day throughout your generations as an everlasting ordinance"- Ex. 12:17
"For the Lord will pass through to strike the Egyptians; and when He sees the blood on the lintel and on the two doorposts, the Lord will pass over the door and not allow the destroyer to come into your houses to strike you. And you shall observe this thing as an ordinance for you and your sons forever"- Ex. 12:23-24
"In the tabernacle of meeting, outside the veil which is before the Testimony, Aaron and his sons shall tend it from evening until morning before the Lord. It shall be a statute forever to their generations on behalf of the children of Israel"- Ex. 27:21
"And you shall make for them linen trousers to cover their nakedness; they shall reach from the waist to the thighs. They shall be on Aaron and on his sons when they come into the tabernacle of meeting, or when they come near the altar to minister in the holy place, that they do not incur iniquity and die. It shall be a statute forever to him and his descendants after him"- Ex. 28:42-43
"Then you shall take the breast of the ram of Aaron’s consecration and wave it as a wave offering before the Lord; and it shall be your portion. And from the ram of the consecration you shall consecrate the breast of the wave offering which is waved, and the thigh of the heave offering which is raised, of that which is for Aaron and of that which is for his sons. It shall be from the children of Israel for Aaron and his sons by a statute forever. For it is a heave offering; it shall be a heave offering from the children of Israel from the sacrifices of their peace offerings, that is, their heave offering to the Lord"- Ex. 29:26-28
"Then the Lord spoke to Moses, saying: 'You shall also make a laver of bronze, with its base also of bronze, for washing. You shall put it between the tabernacle of meeting and the altar. And you shall put water in it, for Aaron and his sons shall wash their hands and their feet in water from it. When they go into the tabernacle of meeting, or when they come near the altar to minister, to burn an offering made by fire to the Lord, they shall wash with water, lest they die. So they shall wash their hands and their feet, lest they die. And it shall be a statute forever to them—to him and his descendants throughout their generations"- Ex. 30:17-21
"Then you shall bring Aaron and his sons to the door of the tabernacle of meeting and wash them with water. You shall put the holy garments on Aaron, and anoint him and consecrate him, that he may minister to Me as priest. And you shall bring his sons and clothe them with tunics. You shall anoint them, as you anointed their father, that they may minister to Me as priests; for their anointing shall surely be an everlasting priesthood throughout their generations"- Ex. 40:12-15
"'This shall be an everlasting statute for you, to make atonement for the children of Israel, for all their sins, once a year.' And he did as the Lord commanded Moses"- Lev. 17:34