Moses
Deuteronomy 33:10ESV·traditional attribution

They shall teach Jacob your rules and Israel your law; they shall put incense before you and whole burnt offerings on your altar.

Matthew Henry Presbyterian @wholebiblehenry

In blessing the tribe of Levi, Moses expresses himself more at large, not so much because it was his own tribe (for he takes no notice of his relation to it) as because it was God's tribe. The blessing of Levi has reference. I.

Commenting on Deuteronomy 33:8-11

John Gill Reformed Baptist @doctorgill

Bless, Lord, his substance,.... Which lay in tithes, firstfruits, &c. for the priests and Levites had no share in the division of the land; unless this can be understood of the cities and suburbs which were given them, or of houses and fields devoted, which fell unto them, or rather of their cattle, for the use of which they had suburbs appointed them; for otherwise...

Keil & Delitzsch Lutheran @keilanddelitzsch

Deu 33:8-11 Levi. - Deu 33:8, Deu 33:9. “Thy right and Thy light is to Thy godly man, whom Thou didst prove in Massah, and didst strive with him at the water of strife; who says to his father and his mother, I see him not; and does not regard his brethren, and does not know his sons: for they observed Thy word, and kept...

Commenting on Deuteronomy 33:8-11