Do not eat with your left hand, for the Satan eats with his left hand.

عَنْ رَسُولِ اللَّهِ ﷺ قَالَ لاَ تَأْكُلُوا بِالشِّمَالِ فَإِنَّ الشَّيْطَانَ يَأْكُلُ بِالشِّمَالِ