Shemot 17:7-9

Orthodox Jewish Bible

⁷ And he called the shem of the place Massah (Testing), and Merivah (Dissatisfaction), because of the riv (chiding, quarreling) of the Bnei Yisroel, and because they put Hashem to the test, saying, Is Hashem among us, or not?

⁸ Then came Amalek, and did battle against Yisroel in Rephidim.

⁹ And Moshe said unto Yehoshua, Choose for us anashim, and go out, do battle with Amalek; tomorrow I will station myself on the top of the hill with the matteh HaElohim in mine yad.