"And Isaac brought her into the tent of Sarah his mother" (Genesis 24:67). All the days that Sarah was alive, a cloud was bound over the entrance of her tent; when she died, that cloud ceased; and when Rebecca came, that cloud returned. All the days that Sarah was alive, the doors were open wide; and when Sarah died, that openness ceased; and when Rebecca came, that openness returned. And all the days that Sarah was alive, a blessing was sent into the dough; and when Sarah died, that blessing ceased; when Rebecca came, it returned. All the days that Sarah was alive, a lamp burned from Sabbath eve to Sabbath eve; and when she died, that lamp ceased; and when Rebecca came, it returned. And when he saw that she did as his mother had done - separating her hallah-portion in purity and shaping her dough in purity - immediately "And Isaac brought her into the tent." Rabbi Yudan said: The Torah has taught you that if a person has grown sons, he should marry them off first, and afterward he himself takes a wife. From whom do you learn this? From Abraham. First, "And Isaac brought her into the tent of Sarah his mother," and afterward (Genesis 25:1): "And Abraham again took a wife."
Sarah's Tent
Bereshit Rabbah 60:16
וַיְבִאֶהָ יִצְחָק הָאֹהֱלָה שָׂרָה אִמּוֹ (בראשית כד, סז), כָּל יָמִים שֶׁהָיְתָה שָׂרָה קַיֶּמֶת הָיָה עָנָן קָשׁוּר עַל פֶּתַח אָהֳלָהּ, כֵּיוָן שֶׁמֵּתָה פָּסַק אוֹתוֹ עָנָן, וְכֵיוָן שֶׁבָּאת רִבְקָה חָזַר אוֹתוֹ עָנָן. כָּל יָמִים שֶׁהָיְתָה שָׂרָה קַיֶּמֶת הָיוּ דְּלָתוֹת פְּתוּחוֹת לִרְוָחָה, וְכֵיוָן שֶׁמֵּתָה שָׂרָה פָּסְקָה אוֹתָהּ הָרְוָחָה, וְכֵיוָן שֶׁבָּאת רִבְקָה חָזְרָה אוֹתָהּ הָרְוָחָה. וְכָל יָמִים שֶׁהָיְתָה שָׂרָה קַיֶּמֶת הָיָה בְּרָכָה מְשֻׁלַּחַת בָּעִסָּה, וְכֵיוָן שֶׁמֵּתָה שָׂרָה פָּסְקָה אוֹתָהּ הַבְּרָכָה, כֵּיוָן שֶׁבָּאת רִבְקָה חָזְרָה. כָּל יָמִים שֶׁהָיְתָה שָׂרָה קַיֶּמֶת הָיָה נֵר דּוֹלֵק מִלֵּילֵי שַׁבָּת וְעַד לֵילֵי שַׁבָּת, וְכֵיוָן שֶׁמֵּתָה פָּסַק אוֹתוֹ הַנֵּר, וְכֵיוָן שֶׁבָּאת רִבְקָה חָזַר. וְכֵיוָן שֶׁרָאָה אוֹתָהּ שֶׁהִיא עוֹשָׂה כְּמַעֲשֵׂה אִמּוֹ, קוֹצָה חַלָּתָהּ בְּטָהֳרָה וְקוֹצָה עִסָּתָהּ בְּטָהֳרָה, מִיָּד וַיְּבִאֶהָ יִצְחָק הָאֹהֱלָה. אָמַר רַבִּי יוּדָן לִמְדָתְךָ תּוֹרָה שֶׁאִם יִהְיֶה לָאָדָם בָּנִים גְּדוֹלִים יִהְיֶה מַשִּׂיאָן מִתְּחִלָּה וְאַחַר כָּךְ הוּא נוֹשֵׂא לוֹ אִשָּׁה, מִמִּי אַתָּה לָמֵד מֵאַבְרָהָם, בַּתְּחִלָּה וַיְבִאֶהָ יִצְחָק הָאֹהֱלָה שָׂרָה אִמּוֹ, וְאַחַר כָּךְ (בראשית כה, א): וַיֹּסֶף אַבְרָהָם וַיִּקַּח אִשָּׁה.