Zechariah asked the angel, “How do you expect me to believe this? I’m an old man and my wife is too old to give me a child. What sign can you give me to prove this will happen?”
Then Abraham laughed so hard he fell to the ground, saying to himself, “How in the world can a hundred-year-old man become a father? How can my wife Sarah get pregnant at ninety?”
Sarah laughed to herself with disbelief, saying, “A woman my age—have a baby? After I’m worn out will I now enjoy marital bliss and conceive—and with my aged husband?”
In spite of being nearly one hundred years old when the promise of having a son was made, his faith was so strong that it could not be undermined by the fact that he and Sarah were incapable of conceiving a child.