Luke 1:18

And Zacharias said to the angel, "By what shall I know this? for I am an old man, and my wife is far advanced in her days."

Luke 1:34

And Mary said to the angel, "How shall this be, since I know not a man?"

Luke 1:7

And they had no child, because Elizabeth was barren, and both were far advanced in their days.

Romans 4:19

And, being not weakened in faith, he attentively considered his own body already dead (he being about a hundred years old), and the deadness of Sarah's womb;

Treasury of Scripture Knowledge

Summary

And Zacharias said unto the angel, Whereby shall I know this? for I am an old man, and my wife well stricken in years.

Whereby

Bible References

Whereby

Luke 1:34
And Mary said to the angel, "How shall this be, since I know not a man?"

For

Luke 1:7
And they had no child, because Elizabeth was barren, and both were far advanced in their days.
Romans 4:19
And, being not weakened in faith, he attentively considered his own body already dead (he being about a hundred years old), and the deadness of Sarah's womb;