'Foundations' in the Bible

So I will tear down the wall which you have plastered with whitewash and bring it down to the ground, so that its foundations will be exposed; when it falls, you will perish in its midst. And you shall know and understand fully that I am the Lord.

And the sword shall come upon Egypt, and great pain shall be in Ethiopia, when the slain shall fall in Egypt, and they shall take away her multitude, and her foundations shall be broken down.

I saw also the height of the house round about: the foundations of the side chambers were a full reed of six great cubits.