'Foundation' in the Bible

According to God’s grace that was given to me, I have laid a foundation as a skilled master builder, and another builds on it. But each one must be careful how he builds on it.

For no one can lay any other foundation than what has been laid down. That foundation is Jesus Christ.

If anyone builds on that foundation with gold, silver, costly stones, wood, hay, or straw,

and if Christ has not been raised, then our proclamation is without foundation, and so is your faith.