Luke 1:8

While he executed the priest's office (en twi ierateuein auton). A favourite idiom in Luke, en with the articular infinitive and the accusative of general reference where the genitive absolute could have been used or a temporal conjunction and finite verb. It is proper Greek, but occurs often in the LXX, which Luke read, particularly in imitation of the Hebrew infinitive construct. The word ierateuw does not appear in the ancient Greek, but in the LXX and this one example in Luke. It is on the Rosetta Stone and the early inscriptions so that the word was simply applied by the LXX translators from current usage.