1 Corinthians 9:13
Do ye not know that they which minister about holy things live of the things of the temple? and they which wait at the altar are partakers with the altar? (1 Corinthians 9:13)
With the altar.
 Part of the animals of certain sacrifices were reserved for the use of the priest. Thus the priest shared the sacrificial animal with the altar (see Lev. 6:16-18; 7:15, 16, 31-34; Num. 18:8-10; Deut. 18:1, 2).
At the altar.
 This phrase no doubt refers specifically to the priests, for it was their duty to offer the sacrifices on the altar. The Levites assisted in the preparation of the sacrifices and the care of the vessels and instruments that were used by the priests, but it was the prerogative of the priests alone to offer the sacrifice before the Lord and to place the incense on the golden altar before the veil (see Ex. 28:1-3; Num. 18:1-7).
Of the temple.
 God had given instructions through Moses that the priests and their assistants should not have any inheritance in the land of Palestine, but should derive their support entirely from the Temple (see Num. 18:20-24; 26:57, 62; Deut. 18:1-8). Being largely free from the responsibilities connected with the care of land and other property, the priests and Levites were able to devote their entire attention to the important work of the Temple. They had no cause to be troubled with the necessity of providing for their temporal wants; God had made provision for that through the tithe and sacrificial offerings of the congregation.
They which minister.
 Not only the priests but also the Levites worked in the Temple and looked after the sacred equipment of that holy building. They kept the Temple clean and prepared supplies for the sanctuary, such as oil and incense; they also provided the musicians for the Temple service (see Num. 1:50-53; 3:5-37; 4:1-33; 8:5-22; 1 Chron. 23:3-6, 24, 27-32).
Know.
Paul referred to the common knowledge among Jews, and those acquainted with them, that the priests were entitled to their support from the things of the Temple. The history of the Israelites has been recorded for the benefit of the Christian church, and the principles of church administration found in the ancient Temple service are worthy of careful study.