'Perpetual' in the Bible

And thou shalt gird them with girdles, Aaron and his sons, and bind head-tires on them: and they shall have the priesthood by a perpetual statute: and thou shalt consecrate Aaron and his sons.

And when Aaron lighteth the lamps at even, he shall burn it, a perpetual incense before Jehovah throughout your generations.

Wherefore the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations, for a perpetual covenant.