G2405–ἱερατεία–hierateia

And as was the way of the priests, he had to go into the Temple to see to the burning of perfumes.

ἱερατείας hi'erateias “priesthood”

And it is true that by the law, those of the sons of Levi who have the position of priests may take a tenth part of the people's goods; that is to say, they take it from their brothers though these are the sons of Abraham.

ἱερατείαν hi'erateian “priestly office”