The Mekhilta records a debate about what tree God showed Moses at Marah to sweeten the bitter waters. The verse says simply "And the Lord showed him a tree" — but which tree? The rabbis disagreed passionately.
Rabbi Yehoshua identified it as a willow tree — a common, humble species found near water sources throughout the ancient Near East. Rabbi Eliezer Hamodai argued it was an olive tree, adding a remarkable detail: there is no tree more bitter than an olive tree. The miracle, in his view, was that God used the most bitter of all trees to cure bitter water. Bitterness healed bitterness.
Rabbi Yehoshua ben Karcha proposed an ivy, while Rabbi Nathan insisted it was a cedar — the noblest and most imposing tree in the ancient world, the same wood that would later be used to build the Temple. Still others abandoned the single-tree theory entirely: God uprooted both a fig and a pomegranate.
The variety of opinions reveals something essential about rabbinic interpretation. The Torah deliberately withholds the species of the tree, and the rabbis understood that silence as an invitation to explore meaning rather than botany. Each identification carries its own theology. The willow suggests humility. The olive suggests that suffering cures suffering. The cedar suggests royal grandeur. The fig and pomegranate — both associated with the Garden of Eden — suggest that the sweetening of Marah was a return to paradise. The tree's identity matters less than what each possibility teaches about God's methods of healing.