'Within' in the Bible

And Sarah laughed within herself, saying, After I am become old, shall I have pleasure, and my lord old?

There are perhaps fifty righteous within the city: wilt thou also destroy and not forgive the place for the sake of the fifty righteous that are therein?

And Jehovah said, If I find at Sodom fifty righteous within the city, then I will forgive all the place for their sakes.

And the children struggled together within her; and she said, If it be so, why am I thus? And she went to inquire of Jehovah.