EJ&T: Numbers 3: God changes his mind about firstborn sons

In the Every Jot and Tittle project, I am listing all of the Bible's commandments from Genesis to Revelation, in accordance with Jesus's words in Matthew 5:18-19. I have no idea how many commandments I'll find, but Jewish tradition claims there are 613. See here for a list of those that I've found so far.

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Only the descendants of Aaron shall be priests.

Thou shalt appoint Aaron and his sons, and they shall wait on their priest's office. Numbers 3:10a

Aaron and his sons, keeping the charge of the sanctuary for the charge of the children of Israel. Numbers 3:38a

And the LORD said unto Aaron, Thou and thy sons and thy father's house with thee shall bear the iniquity of the sanctuary: and thou and thy sons with thee shall bear the iniquity of your priesthood. And thy brethren also of the tribe of Levi, the tribe of thy father, bring thou with thee, that they may be joined unto thee, and minister unto thee: but thou and thy sons with thee shall minister before the tabernacle of witness. And they shall keep thy charge, and the charge of all the tabernacle ... And they shall be joined unto thee, and keep the charge of the tabernacle of the congregation, for all the service of the tabernacle: and a stranger shall not come nigh unto you. And ye shall keep the charge of the sanctuary, and the charge of the altar: that there be no wrath any more upon the children of Israel. And I, behold, I have taken your brethren the Levites from among the children of Israel: to you they are given as a gift for the Lord, to do the service of the tabernacle of the congregation. Therefore thou and thy sons with thee shall keep your priest's office for everything of the altar, and within the vail; and ye shall serve: I have given your priest's office unto you as a service of gift ... And the LORD spake unto Aaron, Behold, I also have given thee the charge of mine heave offerings of all the hallowed things of the children of Israel; unto thee have I given them by reason of the anointing, and to thy sons, by an ordinance for ever. Numbers 18:1-8

Kill anyone who tries to become a priest who is not a descendant of Aaron.

The stranger that cometh nigh shall be put to death. Number 3:10b, 3:38b, 18:7b

Firstborn sons (both man and beast) are no longer God's. He replaced them with Levites.

God originally bought every Israelite firstborn son and animal by killing every firstborn Egyptian son and animal during the Exodus. (See Commandment #22) Now he changes his mind, substituting the Levites for Israelite firstborn sons.

And I, behold, I have taken the Levites from among the children of Israel instead of all the firstborn that openeth the matrix among the children of Israel: therefore the Levites shall be mine; Because all the firstborn are mine; for on the day that I smote all the firstborn in the land of Egypt I hallowed unto me all the firstborn in Israel, both man and beast: mine shall they be: I am the LORD. Numbers 3:12-13

And thou shalt take the Levites for me (I am the LORD) instead of all the firstborn among the children of Israel; and the cattle of the Levites instead of all the firstlings among the cattle of the children of Israel. Numbers 3:41

And thou shalt set the Levites before Aaron, and before his sons, and offer them for an offering unto the Lord. Thus shalt thou separate the Levites from among the children of Israel: and the Levites shall be mine. And after that shall the Levites go in to do the service of the tabernacle of the congregation: and thou shalt cleanse them, and offer them for an offering. For they are wholly given unto me from among the children of Israel; instead of such as open every womb, even instead of the firstborn of all the children of Israel, have I taken them unto me. For all the firstborn of the children of Israel are mine, both man and beast: on the day that I smote every firstborn in the land of Egypt I sanctified them for myself. And I have taken the Levites for all the firstborn of the children of Israel. And I have given the Levites as a gift to Aaron and to his sons from among the children of Israel, to do the service of the children of Israel in the tabernacle of the congregation, and to make an atonement for the children of Israel: that there be no plague among the children of Israel, when the children of Israel come nigh unto the sanctuary. Numbers 8:13-19