Extended Strong's Greek Lexicon (Abbott-Smith based)
to serve as priest
Usage: ἱερατεύω (cl. = ἱεράομαι) [in LXX chiefly for כָּהַן pi. ;] to be a priest, officiate as a priest: Luk.1:8 (the word is frequently in Inscr.; see LS, see word; Deiss., BS, 215; LAE, 70; Cremer, 734).† (AS)