In 1 Samuel 24, again we see God giving David grace. God gave David the grace needed to show kindness to the enemy that was trying to kill him. The restraint that David displayed was even a greater display of faith than defeating the giant Goliath. Apparently, Saul’s men had been lying about David and telling Saul that David was trying to kill him (24:9).
It was no accident that the cave that Saul chose to receive himself was the same one in which David and his men were hiding. Saul was extremely vulnerability during this private moment, and David’s soldiers knew it. In fact, the situation was so remarkable that David’s men concluded that God had made it happen to fulfill prophetic words. David’s men said, “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.’” (1 Samuel 24:4). This prophecy is not mentioned elsewhere in Scripture and probably represents an example of false prophecy
This experience gave David opportunity to prove to Saul that he was not trying to slay Saul, but that he honored the king even though the king was out of the will of God.