Genesis Chapter 21
Isaac is born. Agar and Ismael are cast forth.
21:1. And the Lord visited Sara, as he had promised: and fulfilled what he had spoken.
21:2. And she conceived and bore a son in her old age, at the time that God had foretold her.
21:3. And Abraham called the name of his son, whom Sara bore him, Isaac.
Isaac… This word signifies laughter.
21:4. And he circumcised him the eighth day, as God had commanded him,
21:5. When he was a hundred years old: for at this age of his father, was Isaac born.
21:6. And Sara said: God hath made a laughter for me: whosoever shall hear of it will laugh with me.
21:7. 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?