Genesis 17:7

7And I will aestablish my covenant between me and you and your offspring after you throughout their generations for an everlasting covenant, bto be God to you and to your offspring after you.

Genesis 17:19

19God said, “No, but cSarah your wife shall bear you a son, and you shall call his name dIsaac.
 Isaac means he laughs
I will establish my covenant with him as an everlasting covenant for his offspring after him.
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