In Numbers 4:23 the Lord spoke to Moses about setting up a priesthood to minister before his presence. He described them as being all those who “enter in to perform the service…” The words “perform the service” are from Hebrew words which mean, literally, “fight the warfare.” “Perform” is the translation of the Hebrew word “tsaba,” which means ‘assemble, fight, perform, wait upon, war.’ The word ‘service ‘a mass of persons, organized for war, (specifically, hardship, worship): - appointed time’. The priests entered into the holy place to fight a warfare.