וְנָתַתִּ֨י רוּחִ֤י בָכֶם֙ וִחְיִיתֶ֔ם וְהִנַּחְתִּ֥י אֶתְכֶ֖ם עַל־אַדְמַתְכֶ֑ם וִידַעְתֶּ֞ם כִּי־אֲנִ֧י יְהוָ֛ה דִּבַּ֥רְתִּי וְעָשִׂ֖יתִי נְאֻם־יְהוָֽה׃ (פ)
내가 또 내 신을 너희 속에 두어 너희로 살게 하고 내가 또 너희를 너희 고토에 거하게 하리니 나 여호와가 이 일을 말하고 이룬줄을 너희가 알리라 나 여호와의 말이니라 하셨다 하라
Malbim
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."