(יז) וַיִּפֹּ֧ל אַבְרָהָ֛ם עַל־פָּנָ֖יו וַיִּצְחָ֑ק וַיֹּ֣אמֶר בְּלִבּ֗וֹ הַלְּבֶ֤ן מֵאָֽה־שָׁנָה֙ יִוָּלֵ֔ד וְאִ֨ם־שָׂרָ֔ה הֲבַת־תִּשְׁעִ֥ים שָׁנָ֖ה תֵּלֵֽד׃
(17) Abraham threw himself on his face and laughed, as he said to himself, “Can a child be born to a man a hundred years old, or can Sarah bear a child at ninety?”
(יב) וַתִּצְחַ֥ק שָׂרָ֖ה בְּקִרְבָּ֣הּ לֵאמֹ֑ר אַחֲרֵ֤י בְלֹתִי֙ הָֽיְתָה־לִּ֣י עֶדְנָ֔ה וַֽאדֹנִ֖י זָקֵֽן׃
(12) And Sarah laughed to herself, saying, “Now that I am withered, am I to have enjoyment—with my husband so old?”
(ח) וַיְהִ֗י כִּ֣י אָֽרְכוּ־ל֥וֹ שָׁם֙ הַיָּמִ֔ים וַיַּשְׁקֵ֗ף אֲבִימֶ֙לֶךְ֙ מֶ֣לֶךְ פְּלִשְׁתִּ֔ים בְּעַ֖ד הַֽחַלּ֑וֹן וַיַּ֗רְא וְהִנֵּ֤ה יִצְחָק֙ מְצַחֵ֔ק אֵ֖ת רִבְקָ֥ה אִשְׁתּֽוֹ׃
(8) When some time had passed, Abimelech king of the Philistines, looking out of the window, saw Isaac fondling his wife Rebekah.
Click the link for the source sheet: Yitzchak’s Last Laugh