1-4. God visited Sarah exactly as he said he would; God did to Sarah what he promised: Sarah became pregnant and gave Abraham a son in his old age, and at the very time God had set. Abraham named him Isaac. When his son was eight days old, Abraham circumcised him just as God had commanded.
11-13. The matter gave great pain to Abraham—after all, Ishmael was his son. But God spoke to Abraham, “Don’t feel badly about the boy and your maid. Do whatever Sarah tells you. Your descendants will come through Isaac. Regarding your maid’s son, be assured that I’ll also develop a great nation from him—he’s your son, too.”