וַיֹּ֣אסֶף שָׁא֗וּל לֵרֹ֛א מִפְּנֵ֥י דָוִ֖ד ע֑וֹד וַיְהִ֥י שָׁא֛וּל אֹיֵ֥ב אֶת־דָּוִ֖ד כָּל־הַיָּמִֽים׃ (ס)
And Saul was yet the more afraid of David; and Saul was David’s enemy continually.
Read Jewish philosophical commentary on I Samuel 18:29: and classical philosophical sources.