There is a puzzling incident that happens in the beginning of this Parashah.
According to the midrash (see also Rashi), after Yosef had accused one of the brothers of stealing his cup, Yehudah adamantly proclaimed that anyone who would be caught stealing should be put to death — showing that he was absolutely sure of his family’s integrity. (This is reminiscent of his father, Yaakov’s, earlier declaration in Parashat Vayeitzei when Lavan accused someone in his household of stealing Lavan’s avodah zara idols.) Later, it was revealed that the cup had been in Binyamin’s sack. Of course, Yosef set it all up; so he told them that it was not necessary to put Binyamin to death, instead the youngest brother would have to become a slave in Egypt for life. At this point, Yehudah became enraged.