ולא יכלו לשתות מים ממרה כי מרים הם ... ויצעק אל ד' ויורהו ד' עץ וישלך אל המים וימתקו המים
Horav Yechezkel Abramsky, zl, related the following homiletic rendering of these pesukim. (Apparently, he had heard the exposition from a Chassidic Jew.) On the surface, the pesukim relate that, when Klal Yisrael came to a place which was (later) called Marah, bitter, they found the drinking water to be bitter. As a result, they were unable to drink, and they questioned the choice of rest area. Moshe Rabbeinu prayed to Hashem, Who instructed him to throw a certain tree into the water, and it became sweet. Water is a metaphor for Torah. Be’er chafaruah sarim, “Well that the princes dug”…
