Tafsiran Kejadian 18:12: Rashi, Rashbam, Radak & Sforno

וַתִּצְחַ֥ק שָׂרָ֖ה בְּקִרְבָּ֣הּ לֵאמֹ֑ר אַחֲרֵ֤י בְלֹתִי֙ הָֽיְתָה־לִּ֣י עֶדְנָ֔ה וַֽאדֹנִ֖י זָקֵֽן׃

Sara tertawa dalam hatinya, katanya, “Setelah aku menjadi layu, akankah aku kembali mengalami kesegaran, padahal tuanku pun sudah tua?”

Rashi

בקרבה [SARAH LAUGHED] WITHIN HERSELF (or, REGARDING HER INSIDE) — She reflected on her physical condition, saying, “Is it possible that this womb shall bear a child, that these dried-up breasts shall give forth milk” (Midrash Tanchuma, Shoftim 18).
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Rashbam

עדנה, a form of the skin becoming elastic and the wrinkles straightening out.
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Radak

ותצחק שרה בקרבה, Sarah laughed derisively internally, not audibly; she did not believe that the man who had made the prediction was an angel, though she assumed that he was a prophet.
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Rashi

עדנה means glistening flesh (skin), and so it is used in the Mishna (Menachot 86a): it makes the hair fall out and the skin smooth (מעדן).
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