Reference for Deuteronomy 33:8

וּלְלֵוִ֣י אָמַ֔ר תֻּמֶּ֥יךָ וְאוּרֶ֖יךָ לְאִ֣ישׁ חֲסִידֶ֑ךָ אֲשֶׁ֤ר נִסִּיתוֹ֙ בְּמַסָּ֔ה תְּרִיבֵ֖הוּ עַל־מֵ֥י מְרִיבָֽה׃

And of Levi he said: Thy Thummim and Thy Urim be with Thy holy one, Whom Thou didst prove at Massah, With whom Thou didst strive at the waters of Meribah;

Jastrow

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