Genesis Chapter 21

5And Abraham was a hundred years old, when his son Isaac was born to him.   הוְאַבְרָהָ֖ם בֶּן־מְאַ֣ת שָׁנָ֑ה בְּהִוָּ֣לֶד ל֔וֹ אֵ֖ת יִצְחָ֥ק בְּנֽוֹ:
6And Sarah said, "God has made joy for me; whoever hears will rejoice over me."   ווַתֹּ֣אמֶר שָׂרָ֔ה צְחֹ֕ק עָ֥שָׂה לִ֖י אֱלֹהִ֑ים כָּל־הַשֹּׁמֵ֖עַ יִֽצֲחַק־לִֽי:
will rejoice over me: Heb. יִצְחַק will rejoice for me (Targum Onkelos). And the Midrashic interpretation (Gen. Rabbah 53:8) is: Many barren women were remembered with her; many sick people were healed on that very day; many prayers were answered with hers, and there was much joy in the world.   יצחק לי: ישמח עלי. ומדרש אגדה הרבה עקרות נפקדו עמה, הרבה חולים נתרפאו בו ביום, הרבה תפלות נענו עמה, ורב שחוק היה בעולם:
7And she said, "Who would have said to Abraham that Sarah would nurse children, for I have borne a son to his old age!"   זוַתֹּ֗אמֶר מִ֤י מִלֵּל֙ לְאַבְרָהָ֔ם הֵינִ֥יקָה בָנִ֖ים שָׂרָ֑ה כִּֽי־יָלַ֥דְתִּי בֵ֖ן לִזְקֻנָֽיו:
Who would have said to Abraham: An expression of praise and esteem, as in (Isa. 41:4): “Who has wrought and done?” ; (ibid. 40:26):“Who has created these?” See what He is and Who He is (and how great He is), He Who keeps His promise! The Holy One, blessed be He, promises and does. — [based on Targum Onkelos]   מי מלל לאברהם: לשון שבח וחשיבות, ראו מי הוא ומה הוא, שומר הבטחתו, הקב"ה מבטיח ועושה:
said: Heb. מִלֵל. Scripture uses an unusual word and does not say דִבֶּר because its numerical value [of מִלֵל] is 100, i.e., at the end of one hundred [years] of Abraham. — [from Gen. Rabbah 53:3]   מלל: שינה הכתוב ולא אמר דבר, גימטריה שלו מאה, כלומר לסוף מאה לאברהם:
Sarah would nurse children: Why is “children” in the plural? On the day of the feast, the princesses brought their children with them, and she nursed them, for they were saying,“Sarah did not give birth, but brought in a foundling from the street.” - [from B.M. 87a] See above 17:16.   היניקה בנים שרה: ומהו בנים לשון רבים, ביום המשתה הביאו השרות את בניהן עמהן והיניקה אותם שהיו אומרות לא ילדה שרה אלא אסופי הביאה מן השוק:
8And the child grew and was weaned, and Abraham made a great feast on the day that Isaac was weaned.   חוַיִּגְדַּ֥ל הַיֶּ֖לֶד וַיִּגָּמַ֑ל וַיַּ֤עַשׂ אַבְרָהָם֙ מִשְׁתֶּ֣ה גָד֔וֹל בְּי֖וֹם הִגָּמֵ֥ל אֶת־יִצְחָֽק:
and was weaned: At the end of twenty-four months. — [from Gen. Rabbah 53:10, Keth. 60a]   ויגמל: לסוף עשרים וארבע חדש:
a great feast: for all the prominent people of the generation were there: Shem, Eber, and Abimelech. — [from Tan. Buber, Vayishlach 23] Cf. Gen. Rabbah 53:10.   משתה גדול: שהיו שם גדולי הדור, שם ועבר ואבימלך: