'Perpetual' in the Bible

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

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

But the field of the suburbs of their cities may not be sold; for it is their perpetual possession.