'Foundations' in the Bible

Be it known to the king, that the Jews who came up from you are come to us to Jerusalem; they are building the rebellious and the bad city, and have finished the walls, and repaired the foundations.

Then the same Sheshbazzar came, and laid the foundations of the house of God which is in Jerusalem: and since that time even until now has it been in building, and yet it is not completed.

In the first year of Cyrus the king, Cyrus the king made a decree: Concerning the house of God at Jerusalem, let the house be built, the place where they offer sacrifices, and let its foundations be strongly laid; its height sixty cubits, and its breadth sixty cubits;