Genesis 17 is about the covenant given by the Lord with Abram and his descendants. The Lord appeared to Abram and called him to "walk before me and be blameless". The Lord confirmed His covenant that he would make Abram a father of many nations and gave him a new name, Abraham. God said the covenant would be an everlasting covenant for generations to come and reminded him also of the promise of the whole land of Canaan to be an everlasting possession to Abraham's descendants. God said "I will be their God" and "as for you, you must keep my covenant... every male among you shall be circumcised." God said, "my covenant in your flesh is to be an everlasting covenant". Then God said, "As for Sarai, .. her name will be Sarah.. I will bless her so that she will be the mother of nations, kings of peoples will come from her". But, Abraham fell down laughing , asking "will a son be born to a man a hundred years old?" God answered, "Yes, you wife Sarah will bear you a son, and you will call him Isaac.. I will establish my covenant with him as an everlasting covenant for his descendants". Though Abraham seemed to have doubts about having children at his age, he faithfully took his son Ishmael and all those born in his household, every male including himself, and were all circumcised just as the Lord had commanded to honor the covenant.