Ṭabari comments that Judah stopped the brothers from causing more harm to Joseph, and that he would bring him food. Ibn Kathir comments that Reuben suggested that they put him in the pit so that he might return later to bring him home. But when he returned, he found Joseph gone. "So he screamed and tore his clothes. He put blood on the coat of Joseph. When Jacob learned of this, he tore his clothes, wore a black cloak, and was sad for many days." Ibn 'Abbas writes that the "reason for this trial of Jacob was that he had slaughtered a sheep while he was fasting. He asked a neighbor of his to eat it but he did not. So God tested him with the matter of Joseph." The section that describes Joseph's revelation in the well is interpreted by Ibn 'Abbas: "When they were unaware" (12:15) means "you will tell them about what they did in a situation in which they will not recognize you." This is yet more foreshadowing. A possible reason for his enslavement was that after Abraham had left Egypt he took slaves with him but "Abraham did not dismount for them (following barefoot). Therefore God revealed to him: "Since you did not alight for the slaves and those walking barefoot with you, I will punish you by selling one of your descendants into his country.""