G3728–ὁρκωμοσία–horkōmosia

And since it was not without an oath being taken--

ὁρκωμοσίας. horkōmosias “an oath.”

for these men hold office without any oath having been taken, but He holds it attested by an oath from Him who said to Him, "The Lord has sworn and will not recall His words, Thou art a Priest for ever" --

ὁρκωμοσίας horkōmosias “an oath”ὁρκωμοσίας horkōmosias “an oath”

For the Law constitutes men High Priests--men with all their infirmity--but the utterance of the oath, which came later than the Law, constitutes High Priest a Son who has been made for ever perfect.

ὁρκωμοσίας horkōmosias “oath”