And I will also take of them for priests and for Levites, saith the LORD. – Isaiah 66:21

Priests and Levites had two works to do: something to do towards God for men, and something to do towards men for God. They were engaged to do something towards God for men, and so they offered the sacrifices that were brought to the door of the tabernacle, whether according to the general ordinances, or to any special vows. Spiritually minded, they were much engaged in intercession for the rest of Israel. So there is a people to be found this day who offer unto God acceptable prayer and praise, and in answer to their prayer, unnumbered blessings come down upon the sons of men. I trust there are some here that have power with God in prayer. Ye are the king’s remembrancers; ye make mention of His name and keep not silence; ye cry to God for Sodom, and yet more hopefully ye cry to God for Jerusalem: your prayer ceaseth not, and God’s grace and favor always follow it. In this sense God is constantly taking out, even from amongst the vilest of the vile, a people whom He makes to be priests and Levites for men towards Himself. Another part of their office consisted in speaking for God to the people; “For the priest’s lips should keep knowledge.” As for the Levites, they were as ushers in the schools and tutors in the families of Israel. Amongst the Levites were found those scribes who became the instructors of the people, the copyists of the law, and the expounders of its statutes and ordinances; ministers who opened up to the people, as Ezra did, the knotty points of the old covenant, and expounded the word. So not all of us in the same degree, but all of us in a measure, are to be teachers of God’s revealed truth, even as He has taught us; and He has in this place, and throughout the world, taken out a certain company whom He has made to speak as His mouth to the sons of men—men of His own choosing, and His own sending, who are as priests and Levites for His name…Now, that is parallel to the fact that God does take some of the most unlikely persons, who seem to be the most unsuitable of all, and make these to be His faithful and honored servants among the sons of men. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/0992.cfm