Rashi on Genesis 21:23/רש"י על בראשית כ״א:כ״ג

1ולניני ולנכדי NOR WITH MY SON NOR WITH MY SON’S SON — thus far extends a man’s pity for his descendants (Genesis Rabbah 54:2).

2כחסד אשר עשיתי עמך תעשה עמדי ACCORDING TO THE KINDNESS THAT I HAVE DONE UNTO THEE THOU SHALT DO UNTO ME — viz., that I said to you. (Genesis 20:15) “Behold my land is before thee”.