'Uncovered' in the Bible

for Thou, O my God, Thou hast uncovered the ear of Thy servant -- to build to him a house, therefore hath Thy servant found to pray before Thee.

And David, lifting up his eyes, saw the angel of the Lord there between earth and heaven, with an uncovered sword in his hand stretched out over Jerusalem. Then David and the responsible men, clothed in haircloth, went down on their faces.