The Law of Moses: Priests and Levites to Teach
Source: TTT
Deuteronomy 33:8–10
Concerning Levi he said: “Give Your Thummim to Levi and Your Urim to Your godly one, whom You tested at Massah and contested at the waters of Meribah. / He said of his father and mother, ‘I do not consider them.’ He disregarded his brothers and did not know his own sons, for he kept Your word and maintained Your covenant. / He will teach Your ordinances to Jacob and Your law to Israel; he will set incense before You and whole burnt offerings on Your altar.
Nehemiah 8:7
The Levites—Jeshua, Bani, Sherebiah, Jamin, Akkub, Shabbethai, Hodiah, Maaseiah, Kelita, Azariah, Jozabad, Hanan, and Pelaiah—instructed the people in the Law as they stood in their places.
Malachi 2:7
For the lips of a priest should preserve knowledge, and people should seek instruction from his mouth, because he is the messenger of the LORD of Hosts.