Leviticus 7:36

Which the Lord said the children of Israel were to give them, on the day when he made them his priests. It is their right for ever from generation to generation.

Leviticus 8:12

And some of the oil he put on Aaron's head, to make him holy.

Leviticus 8:30

And Moses took some of the holy oil and of the blood which was on the altar and put it on Aaron and on his robes, and on his sons and on his sons' robes; and made Aaron holy, and his robes and his sons and his sons' robes with him.

Exodus 40:13-15

You are to put on Aaron the holy robes; and you are to put oil on him, and make him holy, so that he may be my priest.

Treasury of Scripture Knowledge

Summary

Which the LORD commanded to be given them of the children of Israel, in the day that he anointed them, by a statute for ever throughout their generations.

Bible References

In the day

Leviticus 8:12
And some of the oil he put on Aaron's head, to make him holy.
Exodus 40:13
You are to put on Aaron the holy robes; and you are to put oil on him, and make him holy, so that he may be my priest.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain