Deuteronomy 33:9

9 which Levi said to his father and to his mother, I know not you, and to his brethren, I know not them; and knew not his sons. These kept thy speech, and these kept thy covenant; (yea, the Levites said to their fathers and their mothers, We do not know you, and to their brothers, We do not know you; and they did not even know their own sons and daughters. They obeyed thy words, and they kept thy covenant.)

Deuteronomy 33:9 Meaning and Commentary

Deuteronomy 33:9

Who said unto his father and to his mother, I have not seen
him
Which some understand of the high priests who were of this tribe, and according to the law were not to defile themselves, or mourn for a father or mother, ( Leviticus 21:11 ) ; or rather, as others, of their having no respect to them in judgment, but determining all causes that came before them according to the law of God, and the rules of justice and equity, in the most impartial manner, without having any regard to the nearest relations to them: with this compare what Christ the antitype of Levi says, in ( Matthew 12:49 Matthew 12:50 ) ;

neither did he acknowledge his brethren, nor knew his own children;
had no respect to persons in judgment, though ever so nearly related: many restrain this to the affair of the golden calf, when the tribe of Levi gathered together, girded their swords on their thighs, and slew every man his brother, companion, and neighbour, guilty of that idolatry, ( Exodus 32:26 Exodus 32:27 ) ;

for they have observed thy word, and kept thy covenant;
the law of God, spoken by him, and had the nature of a covenant with the people of Israel: this the tribe of Levi observed, not only what respects the worship of God, and the contrary to it, idolatry, but all other moral and religious duties; Christ fulfilled the whole law, and did always and all things what pleased the Lord, ( John 8:29 ) .

Deuteronomy 33:9 In-Context

7 This is the blessing of Judah; Lord, hear thou the voice of Judah, and bring in him to his people; his hands shall fight for him, and the helper of him, shall be against his adversaries. (This is the blessing for the tribe of Judah; Lord, hear thou the voice of Judah, and unite them again with the other tribes; thy hands shall fight for them, and thou shalt be their helper against their adversaries.)

8 Also he said to Levi, Thy perfection and thy teaching is of an holy man, whom thou hast proved in temptation, and hast deemed at the Waters of Against-saying; (And he said of the tribe of Levi, Lord, may thy Thummim and thy Urim be with them, thy holy servants, whom thou hast proved at Massah, and hast judged at the waters of Meribah;)

9 which Levi said to his father and to his mother, I know not you, and to his brethren, I know not them; and knew not his sons. These kept thy speech, and these kept thy covenant; (yea, the Levites said to their fathers and their mothers, We do not know you, and to their brothers, We do not know you; and they did not even know their own sons and daughters. They obeyed thy words, and they kept thy covenant.)

10 O! Jacob, they kept thy dooms, and thy law, O! Israel; they shall put incense in thy strong vengeance, and burnt sacrifice on thine altar. (They shall teach Jacob thy precepts, and Israel thy Law; they shall put incense and burnt offerings upon thy altar.)

11 Lord, bless thou the strength of him, and receive thou the works of his hands; smite thou the backs of his enemies, and they that hate him, rise they not. (Lord, bless thou their strength, and receive thou the works of their hands; strike thou the backs of their enemies, and they who hate them, let them never rise up again.)