Genesis 37:12

12.And his brethren went. Before Moses treats of the horrible design of fratricide, he describes the journey of Joseph, and amplifies, by many circumstances, the atrocity of the crime. Their brother approaches them in the discharge of a duty, to make a fraternal inquiry after their state. He comes by the command of his father; and obeys it without reluctance, as appears from his answer. He searches them out anxiously; and though they had changed their place, he spares neither labor nor trouble till he finds them. Therefore their cruelty was something more than madness, seeing they did not shrink with horror from contriving the death of a brother so pious and humane. We now see that Moses does not relate, without a purpose, that a man met Joseph in his wanderings, and told him that his brethren had departed to Dothan. For the greater was his diligence in his indefatigable pursuit, so much the less excusable were they by whom such an unworthy recompense was repaid.