Psalms 95:8 Halakhah

אַל־תַּקְשׁ֣וּ לְ֭בַבְכֶם כִּמְרִיבָ֑ה כְּי֥וֹם מַ֝סָּ֗ה בַּמִּדְבָּֽר׃

'Harden not your heart, as at Meribah, As in the day of Massah in the wilderness;