Strong's Concordance G2407

Original Word: ἱερατεύω
Transliteration: hierateúō
Phonetic Spelling: hee-er-at-yoo'-o
[ἱερατεύω] prolongation from G2409; to be a priest, i.e. perform his functions

Usages throughout the bible

Luke 1:8 - And it came to pass, that while he executed the priest's office G2407 before God in the order of his course,