Exodus 15:24

וַיַּסַּע מֹשֶׁה אֶת־יִשְׂרָאֵל מִיַּם־סוּף וַיֵּצְאוּ אֶל־מִדְבַּר־שׁוּר וַיֵּלְכוּ שְׁלֹֽשֶׁת־יָמִים בַּמִּדְבָּר וְלֹא־מָצְאוּ מָֽיִם

And Moses led Israel onward from the Red Sea, and they went out into the wilderness of Shur; and they went three days in the wilderness, and found no water.

וַיָּבֹאוּ מָרָתָה וְלֹא יָֽכְלוּ לִשְׁתֹּת מַיִם מִמָּרָה כִּי מָרִים הֵם עַל־כֵּן קָרָֽא־שְׁמָהּ מָרָֽה

And when they came to Marah, they could not drink of the waters of Marah, for they were bitter. Therefore the name of it was called Marah.

וַיִּצְעַק אֶל־יְהוָה וַיּוֹרֵהוּ יְהוָה עֵץ וַיַּשְׁלֵךְ אֶל־הַמַּיִם וַֽיִּמְתְּקוּ הַמָּיִם שָׁם שָׂם לוֹ חֹק וּמִשְׁפָּט וְשָׁם נִסָּֽהוּ

And he cried unto the LORD; and the LORD showed him a tree, and he cast it into the waters, and the waters were made sweet. There He made for them a statute and an ordinance, and there He proved them;

וַיֹּאמֶר אִם־שָׁמוֹעַ תִּשְׁמַע לְקוֹל יְהוָה אֱלֹהֶיךָ וְהַיָּשָׁר בְּעֵינָיו תַּעֲשֶׂה וְהַֽאֲזַנְתָּ לְמִצְוֺתָיו וְשָׁמַרְתָּ כָּל־חֻקָּיו כָּֽל־הַמַּֽחֲלָה אֲשֶׁר־שַׂמְתִּי בְמִצְרַיִם לֹא־אָשִׂים עָלֶיךָ כִּי אֲנִי יְהוָה רֹפְאֶֽךָ

and He said: ‘If thou wilt diligently hearken to the voice of the LORD thy God, and wilt do that which is right in His eyes, and wilt give ear to His commandments, and keep all His statutes, I will put none of the diseases upon thee, which I have put upon the Egyptians; for I am the LORD that healeth thee.’