All 3 Uses

perpetual
in
Exodus
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29:9 And thou shalt gird them with girdles, Aaron and his sons, and put the bonnets on them: and the priest's office shall be theirs for a perpetual statute: and thou shalt consecrate Aaron and his sons.†
Chpt 26-30
30:8 And when Aaron lighteth the lamps at even, he shall burn incense upon it, a perpetual incense before the LORD throughout your generations.†
Chpt 26-30 *
31:16 Wherefore the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations, for a perpetual covenant.†
Chpt 30-35

Definitions:

(1) (perpetual)
continuing forever without change; or occurring so frequently it seems constant
(2) (meaning too rare to warrant focus)