'Perpetual Statute' in the Bible

The sons of Aaron, the priests, shall blow the trumpets; and the trumpets shall be for you a perpetual statute throughout your generations.

As for the assembly, there shall be one statute for you and for the alien who sojourns with you, a perpetual statute throughout your generations; as you are, so shall the alien be before the Lord.

Then the Lord spoke to Aaron, “Look, I have put you in charge of the contributions brought to Me. As for all the holy offerings of the Israelites, I have given them to you and your sons as a portion and a permanent statute.

“The contribution of their gifts also belongs to you. I have given all the Israelites’ presentation offerings to you and to your sons and daughters as a permanent statute. Every ceremonially clean person in your house may eat it.

“I give to you and to your sons and daughters all the holy contributions that the Israelites present to the Lord as a permanent statute. It is a permanent covenant of salt before the Lord for you as well as your offspring.”

The Levites will do the work of the tent of meeting, and they will bear the consequences of their sin. The Levites will not receive an inheritance among the Israelites; this is a permanent statute throughout your generations.

The one who gathers the ashes of the heifer shall wash his clothes, and be unclean until evening. This shall be a perpetual statute to the Israelites and to the stranger who lives as a resident alien among them.

And it shall be a perpetual statute unto them, that he that sprinkleth the water of separation shall wash his clothes; and he that toucheth the water of separation shall be unclean until even.