For the source text click/tap here: Sotah 13
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The Gemara asks: And from where did Moses our teacher know where Joseph was buried? The Sages said: Serah, the daughter of Asher, remained from that generation that initially descended to Egypt with Jacob. Moses went to her and said to her: Do you know anything about where Joseph is buried? She said to him: The Egyptians fashioned a metal casket for him and set it in the Nile [Nilus] River as an augury so that its water would be blessed.
In the rabbinic imagination, Serah the granddaughter of Jacob survived not only into the days of Moses, David, and Rabbi Yohanan.
According to one very interesting line of tradition, she followed her people from the Land of Israel into the Babylonian Exile and continued her legendary existence there.
Despite the Talmudic tradition that Serah was granted immortality, the Persian Jews of the city of Isfahan believed that Serah bat Asher actually lived among them, until she died in a great synagogue fire in the 12th century CE.