רְאוּבֵן֙ בְּכֹ֣רִי

Pesikta de-Rav Kahana (10:117): Serah explains to Rabbi Johanan in the house of study that the waters at the splitting of the Reed Sea looked like a glass wall, rather than like a latticework (as he was teaching). Here again, Serah functions as a revealer of lost or hidden knowledge and also in the context of Israel’s redemption from Egypt.