With God, i.e. in concurrence with God, or by God's help he had wrought this salvation. God is so far from being offended with Jonathan, as thou apprehendest, that he hath graciously owned and assisted him in the great service of this day.
Related Commentaries of 1 Samuel 14:45
1 Samuel 14:45
45 And the people said unto Saul, Shall Jonathan die, who hath wrought this great salvation in Israel? God forbid: as the LORD liveth, there shall not one hair of his head fall to the ground; for he hath wrought with God this day. So the people rescued Jonathan, that he died not.