Definition: The word "cornerstone" in the Bible refers to a foundation or foundation stone, which serves as a temporary support for other elements within the structure. It's used metaphorically to describe something foundational that provides stability and strength. The Bible verse specifically uses this concept (Matthew 20:17) where Jesus says: "And I tell you, if two of you shall say together, 'We go into this house, and shall find the thief waiting for us,' your treasures are secure; but what will become of you? If any man shall shed blood at the hand of God, his blood will be on him."