Deuteronomy 33:9 - Clarke's commentary and critical notes on the Bible

Who said unto his father and to his mother, I have not seen him; neither did he acknowledge his brethren, nor knew his own children: for they have observed thy word, and kept thy covenant. Who said unto his father, etc. - There are several difficulties in this and the following verses. Some think they are spoken of the tribe of Levi; others, of all the tribes; others, of the Messiah, etc.; but several of the interpretations founded on these suppositions are too recondite, and should not be resorted to till a plain literal sense is made out. I suppose the whole to be primarily spoken of Aaron and the tribe of Levi. Let us examine the words in this way, Who said unto his father, etc. The law had strictly enjoined that if the father, mother, brother, or child of the high priest should die, he must not mourn for them, but act as if they were not his kindred; see Leviticus 21:11, Leviticus 21:12. Neither must Aaron mourn for his sons Nadab and Abihu, etc., though not only their death, but the circumstances of it, were the most afflicting that could possibly affect a parent's heart. Besides, the high priest was forbidden, on pain of death, to go out from the door of the tabernacle, Leviticus 10:2-7, for God would have them more to regard their function (as good Mr. Ainsworth observes) and duty in his service, than any natural affection whatever. And herein Christ was figured, who, when he was told that his mother and brethren stood without, and wished to speak with him, said: "Who is my mother, and who are my brethren? whosoever shall do the will of my father who is in heaven, the same is my brother, and sister, and mother;" Matthew 12:46-50. It is likely also that Moses may refer here to the fact of the Levites, according to the command of Moses, killing every man his brother, friend, neighbor, and even son, who had sinned in worshipping the golden calf, Exodus 32:26; and in this way the Chaldee paraphrast understands the words.