וַיֵּצֵא֙ אֶל־מוֹצָ֣א הַמַּ֔יִם וַיַּשְׁלֶךְ־שָׁ֖ם מֶ֑לַח וַיֹּ֜אמֶר כֹּֽה־אָמַ֣ר יְהוָ֗ה רִפִּ֙אתִי֙ לַמַּ֣יִם הָאֵ֔לֶּה לֹֽא־יִהְיֶ֥ה מִשָּׁ֛ם ע֖וֹד מָ֥וֶת וּמְשַׁכָּֽלֶת׃
At lumabas siya sa bukal ng tubig, at doon ay inihagis niya ang asin, at sinabi niya: “Ganito ang sabi ng Walang-Hanggan: Pinagaling ko ang tubig na ito; hindi na magmumula pa roon ang kamatayan at ang pagkawala ng mga anak.”
Rashi
To the source of the water. From where the water flowed.
Rashi
And threw salt there. Now is not salt a thing that spoils water? This was a miracle within a miracle.20This miracle was similar to the one performed by Moshe in Marah. After traveling through the wilderness for three days without water, the Bnei Yisroel finally came to a spring only to find the water undrinkably bitter. Moshe threw a tree whose wood was bitter into the water and the water became sweet and drinkable. See Shemos 15:22-26.—Radak