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במסה. כְּשֶׁיָּצְאוּ מִמִּצְרַיִם שֶׁנִּסּוּהוּ בַמַּיִם, שֶׁנֶּאֱמַר הֲיֵשׁ ה' בְּקִרְבֵּנוּ (שמות י"ז): במסה IN MASSAH, when they went forth from Egypt: that they put Him to the test in respect to water, as it is said, (Exodus 17:7) that they asked, “Is the Lord amongst us or not?".