Abraham bowed down with his face touching the ground, but he began to laugh when he thought, "Can a man have a child when he is a hundred years old? Can Sarah have a child at ninety?"

Abraham was ninety-nine years old when he was circumcised,

They had no children because Elizabeth could not have any, and she and Zechariah were both very old.

Zechariah said to the angel, "How shall I know if this is so? I am an old man, and my wife is old also."

Remember your relative Elizabeth. It is said that she cannot have children, but she herself is now six months pregnant, even though she is very old.

Abraham believed and hoped, even when there was no reason for hoping, and so became "the father of many nations." Just as the scripture says, "Your descendants will be as many as the stars."

His faith did not leave him, and he did not doubt God's promise; his faith filled him with power, and he gave praise to God.

It was faith that made Abraham able to become a father, even though he was too old and Sarah herself could not have children. He trusted God to keep his promise.

Though Abraham was practically dead, from this one man came as many descendants as there are stars in the sky, as many as the numberless grains of sand on the seashore.

Abraham reckoned that God was able to raise Isaac from death---and, so to speak, Abraham did receive Isaac back from death.

Rachel said to her father, "Do not be angry with me, sir, but I am not able to stand up in your presence; I am having my monthly period." Laban searched but did not find his household gods.

When a woman has her monthly period, she remains unclean for seven days. Anyone who touches her is unclean until evening.