Thy brother is to thee a covering of the eyes — Thou must look at no other, nor desire to be looked at by any other. Yoke — fellows must be to each other for a covering of the eyes. The marriage — covenant is a covenant with the eyes, like Job's, Job 31:1.
Related Commentaries of Genesis 20:16
Genesis 20:16
16 And unto Sarah he said, Behold, I have given thy brother a thousand pieces of silver: behold, he is to thee a covering of the eyes, unto all that are with thee, and with all other: thus she was reproved.