TSK · Luke 1:18

Then Abraham fell on his face, and laughed, and said in his heart, "Will a child be born to him who is one hundred years old? Will Sarah, who is ninety years old, give birth?"

Moses said, "The people, among whom I am, are six hundred thousand men on foot; and you have said, 'I will give them flesh, that they may eat a whole month.'

Then the captain on whose hand the king leaned answered the man of God, and said, "Behold, if Yahweh made windows in heaven, could this thing be?" He said, "Behold, you shall see it with your eyes, but shall not eat of it."

But they had no child, because Elizabeth was barren, and they both were well advanced in years.

Without being weakened in faith, he didn't consider his own body, already having been worn out, (he being about a hundred years old), and the deadness of Sarah's womb.