"And Sarai said to Abram, Behold now, the LORD has held me back from bearing" (Genesis 16:2). Sarah said: I know the source of my affliction. It is not from witchcraft, nor from any amulet that I need; rather, "the LORD has held me back" from bearing. "Perhaps I will be built up through her." It was taught: anyone who has no children is as though dead, and as though demolished. As though dead, as it says, "And she said to Jacob, Give me children, or else I am a dead woman" (Genesis 30:1). As though demolished, as in "perhaps I will be built up through her," for one builds only what is demolished. "And Abram listened to the voice of Sarai" -- to the voice of the Holy Spirit within her, as you say "and now, listen to the voice of the words of the LORD." "And Sarai, Abram's wife, took Hagar" -- she took her with words. She said to her: Happy are you that you cling to this holy body.
The LORD Has Held Me Back and Sarai Gives Hagar to Abram
Yalkut Shimoni on Torah 79:1
(בראשית טז ב) וַתֹּאמֶר שָׂרַי אֶל אַבְרָם הִנֵּה נָא עֲצָרַנִי ה'. אָמְרָה שָׂרָה, יוֹדַעַת אֲנִי מֵהֵיכָן הִיא מַכָּתִי לֹא מִפְּנֵי כְּשָׁפִים, וְלֹא מִפְּנֵי קָמִיעַ שֶׁאֲנִי צְרִיכָה, אֶלָּא עֲצָרַנִי ה' מִלֶּדֶת. אוּלַי אִבָּנֶה גַּם אָנֹכִי מִמֶּנָּה. תָּנִי, כָּל מִי שֶׁאֵין לוֹ בָּנִים [כְּאִלּו מֵת], כְּאִלּוּ הָרוּס. כְּאִלּוּ מֵת, שֶׁנֶּאֱמַר, (בראשית ל, א) "וַתֹּאמֶר אֶל יַעֲקֹב הָבָה לִי בָּנִים וְאִם אַיִן מֵתָה אָנֹכִי". כְּאִלּוּ הָרוּס, אוּלַי אִבָּנֶּה מִמֶּנָה, וְאֵין בּוֹנִין אֶלָּא הֶהָרוּס. וַיִּשְׁמַע אַבְרָם לְקוֹל שָׂרָי, לְקוֹל רוּחַ הַקֹּדֶשׁ שֶׁבָּהּ, כְּמָה דְּאַתְּ אָמַר "וְעַתָּה שְׁמַע לְקוֹל דִּבְרֵי ה'". (בראשית טז ג) וַתִּקַּח שָׂרַי אֵשֶׁת אַבְרָם אֶת הָגָר, לְקַחְתָּהּ בִּדְבָרִים. אָמְרָה לָהּ, אַשְׁרַיִךְ שֶׁאַתְּ מִדַּבֶּקֶת לַגּוּף הַקָּדוֹשׁ הַזֶּה.