In his first letter to the church at Corinth, Paul gave the believers instruction regarding the general principles underlying the support of God's work in the earth. Writing of his apostolic labors in their behalf, he inquired: CS 69.3
“Who goeth a warfare any time at his own charges? who planteth a vineyard, and eateth not of the fruit thereof? or who feedeth a flock, and eateth not of the milk of the flock? Say I these things as a man? or saith not the law the same also? For it is written in the law of Moses, Thou shalt not muzzle the mouth of the ox that treadeth out the corn. Doth God take care for oxen? or saith He it altogether for our sakes? For our sakes, no doubt, this is written: that he that ploweth should plow in hope; and that he that thresheth in hope should be partaker of his hope. CS 69.4
“If we have sown unto you spiritual things,” the apostle further inquired, “is it a great thing if we shall reap your carnal things? If others be partakers of this power over you, are not we rather? Nevertheless we have not used this power; but suffer all things, lest we should hinder the gospel of Christ. 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? Even so hath the Lord ordained that they which preach the gospel should live of the gospel.” 1 Corinthians 9:7-14. CS 70.1
The apostle here referred to the Lord's plan for the maintenance of the priests who ministered in the temple. Those who were set apart to this holy office were supported by their brethren, to whom they ministered spiritual blessings. “Verily they that are of the sons of Levi, who receive the office of the priesthood, have a commandment to take tithes of the people according to the law.” Hebrews 7:5. The tribe of Levi was chosen by the Lord for the sacred offices pertaining to the temple and the priesthood. Of the priest it was said, “The Lord thy God hath chosen him ... to stand to minister in the name of the Lord.” Deuteronomy 18:5. One tenth of all the increase was claimed by the Lord as His own.... CS 70.2
It was to this plan for the support of the ministry that Paul referred when he said, “Even so hath the Lord ordained that they which preach the gospel should live of the gospel.” And later, in writing to Timothy, the apostle said, “The laborer is worthy of his reward.” 1 Timothy 5:18.—The Acts of the Apostles, 335, 336. CS 70.3