ותהר. פסוק זה מפרש את הפסוק הקודם, מ"ש וה' פקד את שרה כאשר אמר, כי ותהר ותלד שרה, ומ"ש ויעש ה' לשרה כאשר דבר, כי היה למועד אשר דבר אותו אלהים, וכן אמר במד' אני ה' דברתי ועשיתי היכן דבר למועד אשוב אליך, ועשיתי הה"ד ויעש ה' לשרה כאשר דבר, ואתיא כר"י וה' פקד את שרה כאשר אמר, מה שאמר לה הוא באמירה, ויעש ה' לשרה כאשר דבר, מה שדבר לה ע"י מלאך: And she conceived: This verse explains the previous verse - that which is written, "And the Lord took account of Sarah as He had said," since, "Sarah conceived and gave birth." And that which is written, "and the Lord did to Sarah as He had spoken," since it was, "at the set-time of which God had spoken." And likewise did it say in the Midrash (Bereishit Rabbah 52:13), "I, the Lord, have spoken and I have done' (Ezekiel 37:14) - where did He speak? 'At the set time I will return to you' (Genesis 18:14). 'And I have done' - as it is written, 'and the Lord did to Sarah as He had spoken.'" And it comes out like Rabbi Yehudah [Rabbi Nechemiah] (Bereshit Rabbah 53:5): "'And the Lord took account of Sarah as He had said' - that which He had said in an utterance. 'And the Lord did to Sarah as He had spoken' - that which He had spoken to her though an angel."