Immediately, Abraham bowed with his face touching the ground. He laughed as he thought to himself, “Can a son be born to a hundred-year-old man? Can Sarah, a ninety-year-old woman, have a child?”
Afterwards, his brother was born with his hand holding on to Esau’s heel, and so he was named Jacob [Heel]. Isaac was 60 years old when they were born.
Abraham didn’t weaken. Through faith he regarded the facts: His body was already as good as dead now that he was about a hundred years old, and Sarah was unable to have children.