'Perpetual Statute' in the Bible
And the sons of Aaron, the priests, shall blow the trumpets, and the trumpets shall be to you for a perpetual statute throughout your generations.
One statute shall be both for you of the congregation and also for the stranger that sojourns with you, a perpetual statute, for your ages; as ye are, so shall the stranger 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 perpetual 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 perpetual 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 perpetual statute. It is a perpetual 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 perpetual statute throughout your generations.
And he who gathers the ashes of the heifer shall wash his clothes, and be unclean until evening. This shall be to the Israelites and to the stranger who sojourns among them a perpetual statute.
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.