(א) וַיְהִ֖י אַחֲרֵ֣י הַמַּגֵּפָ֑ה וַיֹּ֤אמֶר ה' אֶל־מֹשֶׁ֔ה וְאֶ֧ל אֶלְעָזָ֛ר בֶּן־אַהֲרֹ֥ן הַכֹּהֵ֖ן לֵאמֹֽר׃ (ב) שְׂא֞וּ אֶת־רֹ֣אשׁ ׀ כׇּל־עֲדַ֣ת בְּנֵי־יִשְׂרָאֵ֗ל מִבֶּ֨ן עֶשְׂרִ֥ים שָׁנָ֛ה וָמַ֖עְלָה לְבֵ֣ית אֲבֹתָ֑ם כׇּל־יֹצֵ֥א צָבָ֖א בְּיִשְׂרָאֵֽל׃ ...(מד) בְּנֵ֣י אָשֵׁר֮ לְמִשְׁפְּחֹתָם֒ ...(מו) וְשֵׁ֥ם בַּת־אָשֵׁ֖ר שָֽׂרַח׃ (מז)
(1) When the plague was over, the Lord said to Moses and to Eleazar son of Aaron the priest, (2) “Take a census of the whole Israelite company [of fighters] from the age of twenty years up, by their ancestral houses, all Israelite males able to bear arms.” ...(44) Descendants of Asher by their clans: ... (46) The name of Asher’s daughter was Serah.
וַיַּשְׁבַּ֣ע יוֹסֵ֔ף אֶת־בְּנֵ֥י יִשְׂרָאֵ֖ל לֵאמֹ֑ר פָּקֹ֨ד יִפְקֹ֤ד אֱלֹהִים֙ אֶתְכֶ֔ם וְהַעֲלִתֶ֥ם אֶת־עַצְמֹתַ֖י מִזֶּֽה׃
So Joseph made the sons of Israel swear, saying, “When God has taken notice of you, you shall carry up my bones from here.”
וַיִּקַּ֥ח מֹשֶׁ֛ה אֶת־עַצְמ֥וֹת יוֹסֵ֖ף עִמּ֑וֹ כִּי֩ הַשְׁבֵּ֨עַ הִשְׁבִּ֜יעַ אֶת־בְּנֵ֤י יִשְׂרָאֵל֙ לֵאמֹ֔ר פָּקֹ֨ד יִפְקֹ֤ד אֱלֹהִים֙ אֶתְכֶ֔ם וְהַעֲלִיתֶ֧ם אֶת־עַצְמֹתַ֛י מִזֶּ֖ה אִתְּכֶֽם׃
And Moses took with him the bones of Joseph, who had exacted an oath from the children of Israel, saying, “God will be sure to take notice of you: then you shall carry up my bones from here with you.”
וּמִנַּיִן הָיָה יוֹדֵעַ מֹשֶׁה רַבֵּינוּ הֵיכָן יוֹסֵף קָבוּר? אָמְרוּ: סֶרַח בַּת אָשֵׁר נִשְׁתַּיְּירָה מֵאוֹתוֹ הַדּוֹר. הָלַךְ מֹשֶׁה אֶצְלָהּ, אָמַר לָהּ: כְּלוּם אַתְּ יוֹדַעַת הֵיכָן יוֹסֵף קָבוּר? אָמְרָה לוֹ: אָרוֹן שֶׁל מַתֶּכֶת עָשׂוּ לוֹ מִצְרִים וּקְבָעוּהוּ בְּנִילוּס הַנָּהָר, כְּדֵי שֶׁיִּתְבָּרְכוּ מֵימָיו. הָלַךְ מֹשֶׁה וְעָמַד עַל שְׂפַת נִילוּס, אָמַר לוֹ: יוֹסֵף יוֹסֵף! הִגִּיעַ הָעֵת שֶׁנִּשְׁבַּע הַקָּדוֹשׁ בָּרוּךְ הוּא שֶׁאֲנִי גּוֹאֵל אֶתְכֶם, וְהִגִּיעָה הַשְּׁבוּעָה שֶׁהִשְׁבַּעְתָּ אֶת יִשְׂרָאֵל. אִם אַתָּה מַרְאֶה עַצְמְךָ מוּטָב, אִם לָאו — הֲרֵי אָנוּ מְנוּקִּין מִשְּׁבוּעָתֶךָ. מִיָּד צָף אֲרוֹנוֹ שֶׁל יוֹסֵף.
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. Moses went and stood on the bank of the Nile. He said to Joseph: Joseph, Joseph, the time has arrived about which the Holy One, Blessed be He, took an oath saying that I, i.e., God, will redeem you. And the time for fulfillment of the oath that you administered to the Jewish people that they will bury you in Eretz Yisrael has arrived. If you show yourself, it is good, but if not, we are clear from your oath. Immediately, the casket of Joseph floated to the top of the water.