The priests were called to faithfully teach God’s law to the people (Leviticus 10:11; Deuteronomy 33:10), and the people of Israel were to act in accordance with what they were taught (Deuteronomy 17:10–11). And this Levi and his earlier descendants did.
6 True instruction was in his mouth, and no wrong was found on his lips. He walked with me in peace and uprightness, and he turned many from iniquity.