When Abram was ninety-nine years old, the Lord appeared to Abram and said to him, I am your God, be well-pleasing before Me, and be blameless.

And Abraham fell upon his face and laughed; and said in his heart, Shall there be a child to one who is a hundred years old, and shall Sarah, who is ninety years old, bear [a child]?

And not weakening in faith, he did not consider his own body, already having been worn out (being about a hundred years old), and the deadness of Sarah's womb,