Musar על בראשית 42:1

למה תתראו . The Talmud Taanit 10b, on which Rashi bases his first explanation comments that although Jacob and his family were not short of provisions, Jacob told his sons not to arouse the envy of their neighbors by appearing to have ample supplies. The Zohar feels that by provoking one's neighbors envy one also provokes Heavenly judgment.