Luke 1:18

And Zachariah said to the angel: By what sign shall I know this? for I am old, and my wife is advanced in years.

Luke 1:34

But 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 they were both advanced in years.

Romans 4:19

And not being weak in faith, he considered not his own body, which was already dead, (for he was about a hundred years old,) nor 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
But 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 they were both advanced in years.
Romans 4:19
And not being weak in faith, he considered not his own body, which was already dead, (for he was about a hundred years old,) nor the deadness of Sarah's womb;