(Exodus 14:22) "And the children of Israel came in the midst of the sea on the dry land": R. Meir perceives it one way; R. Yehudah, another. R. Meir: When the tribes were standing at the sea, each said: I will go first. In the midst of the hue and cry, Benjamin sprang first into the sea, as it is written (Psalms 68:28-29) "There, Benjamin, the young (i.e., the youngest of the tribes) rodem, the princes of Judah rigmatham, the princes of Zevulun, and princes of Naftali. Your G–d has commanded your strength. Be strong, O G–d, — this (strength which) You have wrought for us!" Read it not "rodem," but "rad yam" ("went down into the sea") — whereupon Judah began to stone them ("rigmatham"), viz. "the princes of Judah rigmatham."
The Children of Israel Came
Mekhilta Tractate Vayehi Beshalach 6:1