'Perpetual Statute' in the Bible

And you shall gird them with belts, Aaron and his sons, and put the turbans on them: and the priest's office shall be theirs for a perpetual statute: and you shall consecrate Aaron and his sons.

It shall be a perpetual statute for your generations throughout all your dwellings, that you eat neither fat nor blood.

And it shall be Aaron's and his sons'; and they shall eat it in the holy place: for it is most holy unto him of the offerings of the LORD made by fire, a perpetual statute.

And it shall be a perpetual statute unto them, that he that sprinkles the water of purification shall wash his clothes; and he that touches the water of purification shall be unclean until evening.