James Strong - Słownik Języka Greckiego

And inasmuch as, not without an oath^G3728 he was made priest:
KJV Hebr 7:20

(For those priests were, made without an oath;^G3728 but this with an oath^G3728 by him that said unto him, The Lord sware and will not repent, Thou art a priest for ever after the order of Melchisedec:)
KJV Hebr 7:21

For the law maketh men high priests which have infirmity; but the word of the oath,^G3728 which was since the law, maketh the Son, who is consecrated for evermore.
KJV Hebr 7:28