'Single' in the Bible

And it came to pass, when he began to reign, as soon as he sat on his throne, that he smote all the house of Baasha: he left him not a single man-child, neither of his kinsfolks, nor of his friends.

The lamp of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light.

The lamp of thy body is thine eye: when thine eye is single, thy whole body also is full of light; but when it is evil, thy body also is full of darkness.