John Chrysostom
They conversed among themselves, unaware that Joseph could overhear them. It seemed as though he was not cognizant of their language, so he had an interpreter relay his words to them while conveying theirs back to him. Upon hearing this, Reuben addressed them, saying, "Did I not warn you, 'Do not wrong the young man,' but you disregarded my counsel; look now, his blood is being demanded." He reminds them that he had previously urged them against harming him. Thus, now 'his blood is being required' because in your hearts, you have already committed this act. While you may not have struck him down with a sword, selling him into slavery proves to be a fate worse than death. Consequently, his blood is demanded now. Consider how it feels to bear the burdens of guilt, having this internal accuser continually with you, crying out and bringing your misdeeds to remembrance.