Shemot 17:1-7

And kol Adat Bnei Yisroel journeyed from the midbar of Sin, setting out, according to the commandment of HASHEM, and encamped in Rephidim; and there was no mayim for HaAm to drink. Wherefore the people did chide (quarrel, become dissatisfied with) Moshe, and said, Give us mayim that we may drink. And Moshe said unto them, Why chide ye with me? Why do ye put HASHEM to the test? And HaAm thirsted there for mayim; and the people murmured against Moshe, and said, Why is this that thou hast brought us up out of Mitzrayim, to kill me and my banim and my livestock with tzama (thirst)? And Moshe cried unto HASHEM, saying, What shall I do with this people? They are almost ready to stone me. And HASHEM said unto Moshe, Go on ahead of HaAm, and take with thee Ziknei Yisroel; and thy matteh (staff) wherewith thou struck the Nile, take in thine yad, and go. Hineni, I will stand before thee there upon the tzur in Chorev; thou shalt strike the tzur, and there shall come mayim out of it, that HaAm may drink. Moshe did so in the sight of the Ziknei Yisroel. 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?