כְּבַקָּרַת֩ רֹעֶ֨ה עֶדְר֜וֹ בְּיוֹם־הֱיוֹת֤וֹ בְתוֹךְ־צֹאנוֹ֙ נִפְרָשׁ֔וֹת כֵּ֖ן אֲבַקֵּ֣ר אֶת־צֹאנִ֑י וְהִצַּלְתִּ֣י אֶתְהֶ֗ם מִכָּל־הַמְּקוֹמֹת֙ אֲשֶׁ֣ר נָפֹ֣צוּ שָׁ֔ם בְּי֥וֹם עָנָ֖ן וַעֲרָפֶֽל׃
Rashi on Ezekiel
separated when they are scattered, and he walks among them and gathers them back together.
Rashi on Ezekiel
on a cloudy and dark day for it is usual for the flocks to scatter on a cloudy day.