וקרהו אסון בדרך הא בבית לא שאין השטן מקטרג אלא בשעת הסכנה
But Binyamin, Yosef’s brother, Yaakov sent not with his brethren; for he said, “Lest peradventure harm befall him.”
Classical midrash on Yaakov’s protective fear for Binyamin.
פֶּן יִקְרָאֶנּוּ אָסוֹן. יַעֲקֹב חוֹשֵׁשׁ עַל בִּנְיָמִין מִשּׁוּם שֶׁהוּא הַנִּשְׁאָר מִבְּנֵי רָחֵל.
English: Rashi, citing Bereishis Rabbah 91:9, explains that the danger implied by “lest harm befall him” is associated with the road, because the Satan accuses at a time of danger.
On the daf / in context: The midrash connects Yaakov’s refusal to send Binyamin with the still-unhealed wound of Yosef’s loss; the same word “ason” reappears later in Yaakov’s speech.
Type of Learning: Derash on the verse (classic midrash) — not a formal named middah of the 13.
What Is Learned: Yaakov’s protective withholding of Binyamin is the direct consequence of the earlier tragedy; the fear of “ason” shapes the entire second half of the narrative.