פירוש על מלאכי 2:7

For a priest’s lips It is incumbent upon them to guard knowledge. Why? Because... teaching should be sought from his mouth This matter has already (Deut. 33:10) been delivered to them. “They shall teach Your judgments to Jacob.”

for he is a messenger the agent of the Holy One, blessed be He; like the ministering angels, to serve Him and to enter into His compartment. [I.e., into the place where God’s presence is manifest.]