'Eye' in the Bible

But keep an eye on it. If it should go up by the way of its own border to Beth Shemesh, then he has brought this great calamity on us. But if that is not the case, then we will know that it was not his hand that struck us; rather, it just happened to us by accident."

Meanwhile, Nahash, king of the Ammonites, had been severely oppressing the descendants of Gad and descendants of Reuben, gouging out their right eyes and not allowing Israel to have a deliverer. No one was left among the Israelis across the Jordan whose right eye Nahash, king of the Ammonites, had not gouged out. However, 7,000 men had escaped from the Ammonites and entered Jabesh-gilead.

Nahash the Ammonite replied, “I’ll make one with you on this condition: that I gouge out everyone’s right eye and humiliate all Israel.”

From then on Saul kept his eye on David.

Behold, this day thine eyes have seen how that the LORD had delivered thee to day into mine hand in the cave: and some bade me kill thee: but mine eye spared thee; and I said, I will not put forth mine hand against my lord; for he is the LORD'S anointed.