'Corner' in the Bible

As Samuel turned to go Saul seized him by the corner of his robe, and it tore.

When Saul was told that David had come to Keilah, Saul said, "God has delivered him into my hand, for he has boxed himself into a corner by entering a city with two barred gates."

so they said to him, “Look, this is the day the Lord told you about: ‘I will hand your enemy over to you so you can do to him whatever you desire.’” Then David got up and secretly cut off the corner of Saul’s robe.

Afterward, David’s conscience bothered him because he had cut off the corner of Saul’s robe.

See, my father! Look at the corner of your robe in my hand, for I cut it off, but I didn’t kill you. Look and recognize that there is no evil or rebellion in me. I haven’t sinned against you even though you are hunting me down to take my life.