so he warned David, saying, “My father Saul intends to kill you. Be on your guard in the morning; find a secret place and hide there.
Saul and Jonathan appear here in their different characters, with reference to David. I. Never was enemy so unreasonably cruel as Saul. He spoke to his son and all his servants that they should kill David, Sa1 19:1. His projects to take him off had failed, and therefore he proclaims him an out-law, and charges all about him, upon their allegiance, to take the first opportunity to kill David.
Commenting on 1 Samuel 19:1-7
But Jonathan, Saul's son, delighted much in David,.... In his company and conversation; he loved him with a love of complacency, and was constant and steadfast in it, and which was a kind providence to David; for by this means he came to the knowledge of Saul's designs upon him, and could the better guard against him: and Jonathan told David, saying, Saul my father...
Take heed to thyself until the morning - Perhaps the order was given to slay him the next day; and therefore Jonathan charges him to be particularly on his guard at that time, and to hide himself.