Then Saul's anger was kindled against Jonathan, and he said to him, You son of a perverse rebellious woman, don't I know that you have chosen the son of Jesse to your own shame, and to the shame of your mother's nakedness?
"You son of a perverse and rebellious woman"  (1 Samuel 20:30) This vile slur cast upon Jonathan was the ancient equivalent of the vulgar present-day insult, "You son-of-a-bitch."  "These words possibly meant that Jonathan was born of a prostitute."[11]  From the most ancient times, it has been customary to revile a person by slandering or belittling his ancestors.  It became perfectly clear to all present, when Saul thus addressed Jonathan, that Saul would not only kill David if possible, but anyone else who stood between him and the achievement of his fiendish purpose.