'Perpetual' in the Bible

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

This is the offering of Aaron and of his sons, which they shall offer unto the LORD in the day when he is anointed; the tenth part of an ephah of fine flour for a meat offering perpetual, half of it in the morning, and half thereof at night.

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 by a perpetual statute.

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