Rashi on Deuteronomy 33:8/רש"י על דברים ל״ג:ח׳

1וללוי אמר means AND OF LEVI HE SAID (not to Levi).

2תמיך ואוריך THY THUMMIM AND URIM — He is addressing God (not Levi).

3אשר נסיתו במסה WHOM THOU DIDST TRY WITH TRIALS — [Since this is said in praise of the Levites] we may gather from it that they did not murmur together with the other tribes.

4תריבהו וגו׳ THOU DIDST STRIVE WITH HIM [AT THE WATERS OF MERIBAH] — Understand this as the Targum has it: (“Thou didst put him to the test”). — Another explanation of תריבהו על מי מריבה: Thou didst seek an occasion against him to come with a pretext, for if Moses said, “Hear now, ye rebels”, what sin did Aaron and Miriam commit? (why were they not allowed to enter the land?) Sifrei Devarim 349:3).