האהלה שרה אמו. וַיְבִיאֶהָ הָאֹהֱלָה וְנַעֲשֵׂית דֻּגְמַת שָׂרָה אִמּוֹ, כְּלוֹמַר וַהֲרֵי הִיא שָׂרָה אִמּוֹ, שֶׁכָּל זְמַן שֶׁשָּׂרָה קַיֶּמֶת הָיָה נֵר דָּלוּק מֵעֶרֶב שַׁבָּת לְעֶרֶב שַׁבָּת וּבְרָכָה מְצוּיָה בָּעִסָּה וְעָנָן קָשׁוּר עַל הָאֹהֶל, וּמִשֶּׁמֵּתָה פָּסְקוּ, וּכְשֶׁבָּאת רִבְקָה חָזְרוּ (בראשית רבה): האהלה שרה אמו INTO HIS MOTHER SARAH’S TENT — He brought her into the tent and she became exactly like his mother Sarah — that is to say, the words signify as much as, [And he brought her into the tent] and, behold, she was Sarah, his mother). For whilst Sarah was living, a light had been burning in the tent from one Sabbath eve to the next, there was always a blessing in the dough (a miraculous increase) and a cloud was always hanging over the tent (as a divine protection), but since her death all these had stopped. However, when Rebecca came, they reappeared” (Genesis Rabbah 60:16).
אחרי אמו. דֶּרֶךְ אֶרֶץ כָּל זְמַן שֶׁאִמּוֹ שֶׁל אָדָם קַיֶּמֶת, כָּרוּךְ הוּא אֶצְלָהּ; וּמִשֶּׁמֵּתָה, הוּא מִתְנַחֵם בְּאִשְׁתּוֹ: אחרי אמו [AND ISAAC WAS COMFORTED] AFTER HIS MOTHER’S DEATH — It is natural that whilst a man’s mother is living he is wrapped up in her, but when she dies he finds comfort in his wife (Pirkei DeRabbi Eliezer 32).