(סז) האהלה שרה אמו וַיְבִיאָהָ הָאֹהֱלָה וְנַעֲשֵית דּוּגְמַת שָׂרָה אִמוֹ, כְּלוֹמַר, וַהֲרֵי הִיא שָׂרָה אִמוֹ, שֶׁכָּל זְמַן שֶׁשָּׂרָה קַיֶמֶת, הָיָה נֵר דָּלוּק מֵעֶרֶב שַׁבָּת לְעֶרֶב שַׁבָּת, וּבִרָכָה מְצוּיָּה בְּעִיסָּה, וְעָנָן קָשׁוּר עַל הָאֹהֶל וּמִשָׁמֵּתָה פָסְקוּ, וּכְשֶׁבָּאת רִבְקָה חָזָרוּ (בראשית רבה):
(סח) אחרי אמו דֶּרֶךְ אֶרֶץ כָּל זְמַן שֶׁאִמּוֹ שֶׁל אָדָם קַיֶּמֶת, בָּרוּךְ הוּא אֶצְלָהּ; וּמִשֶּׁמֵּתָה, הוּא מִתְנַחֵם בְּאִשְׁתּוֹ:
(67) 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).
(68) 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).