And Abraham called the name of his son, whom Sara bore him, Isaac.
And he circumcised him the eighth day, as God had commanded him,
When he was a hundred years old: for at this age of his father, was Isaac born.
And Sara said: God hath made a laughter for me: whosoever shall hear of it will laugh with me.
And again she said: Who would believe that Abraham should hear that Sara gave suck to a son, whom she bore to him in his old age?
And the child grew, and was weaned: and Abraham made a great feast on the day of his weaning.
And when Sara had seen the son of Agar, the Egyptian, playing with Isaac, her son, she said to Abraham:
Cast out this bondwoman and her son; for the son of the bondwoman shall not be heir with my son Isaac.
Abraham took this grievously for his son.
And God said to him: Let it not seem grievous to thee for the boy, and for thy bondwoman: in all that Sara hath said to thee, hearken to her voice: for in Isaac shall thy seed be called.
But I will make the son also of the bondwoman a great nation, because he is thy seed.