The words “God is witness between you and me” should not be taken lightly. God is the omniscient witness. He is ever-present and sees all—all thoughts, all actions, all intent, and all desire. Even the darkness is pure light to Him. Nothing is hidden from His holy eyes, and we should therefore live in the light of such a fearful truth.
Genesis 31:50 If you afflict my daughters, or if you take other wives besides my daughters,although no man is with us—see, God is witness between you and me!”