Commentary for I Samuel 18:29

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.

Rashi on I Samuel