וַיֹּ֗אמֶר הֵ֥ן עוֹד֙ הַיּ֣וֹם גָּד֔וֹל לֹא־עֵ֖ת הֵאָסֵ֣ף הַמִּקְנֶ֑ה הַשְׁק֥וּ הַצֹּ֖אן וּלְכ֥וּ רְעֽוּ׃
האָט ער צו זײ געזאָגט: זעט, דער טאָג איז נאָך גרױס, נאָך ניט צײַט דאָס פֿי זאָל אײַנגעזאַמלט װערן; טרינקט אָן די שאָף, און גײט פֿיטערט.
Rashi
הן עוד היום גדול LO, IT IS YET HIGH DAY — Because he saw them lying down he thought that they wished to take the cattle home, and that they should not graze any longer. He, therefore, said to them, “Lo, it is yet high day” — meaning, if you are hired men you have not yet finished your day’s task, and if these are your own cattle, nevertheless — 'לא עת האסף המקנה וגו IT IS NOT YET TIME FOR THE CATTLET TO BE GATHERED TOGETHER TO TAKE THEM HOME (Genesis Rabbah 70:11).
Chizkuni
לא עת האסף המקנה, “it is not yet time to bring the cattle home.” The use of the word: האסף in this context also occurs in Judges 19,18: ואין איש מאסף אותי הביתה, “and no one is willing to give me shelter in his house.”
Sforno
The day is yet long. He thought they were shirking their duties. The righteous are disturbed by injustice even when they are not the victims.