וַיֹּ֤אמֶר דָּוִד֙ אֶל־לִבּ֔וֹ עַתָּ֛ה אֶסָּפֶ֥ה יוֹם־אֶחָ֖ד בְּיַד־שָׁא֑וּל אֵֽין־לִ֨י ט֜וֹב כִּ֣י הִמָּלֵ֥ט אִמָּלֵ֣ט ׀ אֶל־אֶ֣רֶץ פְּלִשְׁתִּ֗ים וְנוֹאַ֨שׁ מִמֶּ֤נִּי שָׁאוּל֙ לְבַקְשֵׁ֤נִי עוֹד֙ בְּכָל־גְּב֣וּל יִשְׂרָאֵ֔ל וְנִמְלַטְתִּ֖י מִיָּדֽוֹ׃
大衛心裡說：«總有一天，我必死在掃羅手中。對我來說，最好的辦法莫過於逃往非利士地；這樣，掃羅就會對我死心，不再在以色列全境搜尋我，我便可以脫離他的手。»
Rashi
Now I might perish one day. Perhaps he will ambush me and suddenly attack me.1Dovid did not trust Shaul and was convinced that he was laying a trap for him by asking him to remain.—Metzudas Dovid