וַיְדַבֵּ֣ר שָׁא֗וּל אֶל־יוֹנָתָ֤ן בְּנוֹ֙ וְאֶל־כָּל־עֲבָדָ֔יו לְהָמִ֖ית אֶת־דָּוִ֑ד וִיהֽוֹנָתָן֙ בֶּן־שָׁא֔וּל חָפֵ֥ץ בְּדָוִ֖ד מְאֹֽד׃
And Saul spoke to Jonathan his son, and to all his servants, that they should slay David; but Jonathan Saul’s son delighted much in David.
Read kabbalistic (mystical) interpretation of I Samuel 19:1: and classical mystical sources.