וַיִּקַּח֩ דָּוִ֨ד אֶֽת־הַחֲנִ֜ית וְאֶת־צַפַּ֤חַת הַמַּ֙יִם֙ מֵרַאֲשֹׁתֵ֣י שָׁא֔וּל וַיֵּלְכ֖וּ לָהֶ֑ם וְאֵ֣ין רֹאֶה֩ וְאֵ֨ין יוֹדֵ֜עַ וְאֵ֣ין מֵקִ֗יץ כִּ֤י כֻלָּם֙ יְשֵׁנִ֔ים כִּ֚י תַּרְדֵּמַ֣ת יְהוָ֔ה נָפְלָ֖ה עֲלֵיהֶֽם׃
So David took the spear and the cruse of water from Saul’s head; and they got them away, and no man saw it, nor knew it, neither did any awake; for they were all asleep; because a deep sleep from the LORD was fallen upon them.
Read Jewish philosophical commentary on I Samuel 26:12: and classical philosophical sources.