1 And Saul speaketh unto Jonathan his son, and unto all his servants, to put David to death,
1 Samuel 19:1 Cross References - YLT
1 Samuel 18:1
1 And it cometh to pass, when he finisheth to speak unto Saul, that the soul of Jonathan hath been bound to the soul of David, and Jonathan loveth him as his own soul.
1 Samuel 18:9
9 and Saul is eyeing David from that day and thenceforth.