These things therefore being manifest to us, and since we look into the depths of the divine knowledge, it behooves us to do all things in [their proper] order, which the Lord has commanded us to perform at stated times. He has enjoined offerings [to be presented] and service to be performed [to Him], and that not thoughtlessly or irregularly, but at the appointed times and hours. Where and by whom He desires these things to be done, He Himself has fixed by His own supreme will, in order that all things being piously done according to His good pleasure, may be acceptable unto Him. Those, therefore, who present their offerings at the appointed times, are accepted and blessed; for inasmuch as they follow the laws of the Lord, they sin not. For his own peculiar services are assigned to the high priest, and their own proper place is prescribed to the priests, and their own special ministrations devolve on the Levites. The layman is bound by the laws that pertain to laymen.
XLII. THE ORDER OF MINISTERS IN THE CHURCH.
The apostles have preached the Gospel to us from the Lord Jesus Christ; Jesus Christ [has done so] from God. Christ therefore was sent forth by God, and the apostles by Christ. Both these appointments, then, were made in an orderly way, according to the will of God. Having therefore received their orders, and being fully assured by the resurrection of our Lord Jesus Christ, and established in the word of God, with full assurance of the Holy Ghost, they went forth proclaiming that the kingdom of God was at hand. And thus, preaching through countries and cities, they appointed the first-fruits [of their labors], having first proved them by the Spirit, to be bishops and deacons of those who should afterwards believe. Nor was this any new thing, since indeed many ages before it was written concerning bishops and deacons. For thus saith the Scripture in a certain place, “I will appoint their bishops in righteousness, and their deacons in faith.” [Isa_60:17].
XLIV. THE ORDINANCES OF THE APOSTLES, THAT THERE MIGHT BE NO CONTENTION RESPECTING HE PRISTLY OFFICE.
Our apostles also knew, through our Lord Jesus Christ, and there would be strife on account of the office of the episcopate3. For this reason, therefore, inasmuch as they had obtained a perfect fore-knowledge of this, they appointed those [ministers] already mentioned, and afterwards gave instructions, that when these should fall asleep, other approved men should succeed them in their ministry. We are of opinion, therefore, that those appointed by them, or afterwards by other eminent men, with the consent of the whole Church, and who have blamelessly served the flock of Christ in a humble, peaceable, and disinterested4 spirit, and have for a long time possessed the good opinion of all, cannot be justly dismissed from the ministry. For our sin will not be small, if we eject from the episcopate5 those who have blamelessly and holily fulfilled its duties. Blessed are those presbyters6 who, having finished their course before now, have obtained a fruitful and perfect departure [from this world]; for they have no fear lest anyone deprive them of the place now appointed them. But we see that ye have removed some men of excellent behavior from the ministry, which they fulfilled blamelessly and with honor.
~St. Clement- Corinthians Vol. 1