Following are a number of back-translations as well as a sample translation for translators of Deuteronomy 33:8:

• Kupsabiny: “He said about the clan of Levi,
  ‘Oh, God, show your power through Thummim
  and show (it) even through Urim.
  Those were the people you tested at Massah
  and you quarreled with them at Meribah.” (Source: Kupsabiny Back Translation)
• Newari: “About the tribe of Levi he said,
  "You have given your Thummim and Urim into the hands of the descendants of Levi, the people you love.
  You tested them at Massah,
  You struggle with them at the waters of Meribah.” (Source: Newari Back Translation)
• Hiligaynon: “Moises said concerning the tribe of Levi,
  ‘O LORD, you (plur.) gave the Thummim and Urim to your faithful servant who are the descendants of Levi.
  Your tested them in Masa and rebuked beside the water/spring of Meriba.” (Source: Hiligaynon Back Translation)
• English: “I say this about the tribe of Levi:
  Yahweh, give to those who are dedicated to you the sacred stones that they will use to find out what you want to be done;
  You tested them at a spring in the desert, a spring that they named Massah and also named Meribah
  to find out if they would remain loyal to/continue to obey you.” (Source: Translation for Translators)