Genesis 17:19
"And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his seed after him."
Cross References (ranked by relevance)
Genesis 21:6
And Sarah said, God hath made me to laugh, so that all that hear will laugh with me.
Genesis 17:21
But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.
Genesis 26:3
Sojourn in this land, and I will be with thee, and will bless thee; for unto thee, and unto thy seed, I will give all these countries, and I will perform the oath which I sware unto Abraham thy father;