{While he executed the priest's office} (en t(9369) hierateuein
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 hierateu(935c) 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.