וַיִּקְרָא֙ שֵׁ֣ם הַמָּק֔וֹם מַסָּ֖ה וּמְרִיבָ֑ה עַל־רִ֣יב ׀ בְּנֵ֣י יִשְׂרָאֵ֗ל וְעַ֨ל נַסֹּתָ֤ם אֶת־יְהוָה֙ לֵאמֹ֔ר הֲיֵ֧שׁ יְהוָ֛ה בְּקִרְבֵּ֖נוּ אִם־אָֽיִן׃ (פ)
And the name of the place was called Massah, and Meribah, because of the striving of the children of Israel, and because they tried the LORD, saying: ‘Is the LORD among us, or not?’
Read kabbalistic (mystical) interpretation of Exodus 17:7: and classical mystical sources.