وعن سلمةَ بن الأَكْوَع
أنَّ رَجُلاً أَكَلَ عِنْدَ رَسُولِ الله بِشِمَالِهِ، فَقَالَ: «كُلْ بِيَمِينِكَ» قَالَ: لا أسْتَطِيعُ. قَالَ: «لا اسْتَطَعْتَ»! مَا مَنَعَهُ إِلا الكِبْرُ! فَمَا رَفَعَهَا إِلَى فِيهِ
A man ate with his left hand in the presence of Messenger of Allah (sallallahu alayhi wa sallam), whereupon he said, “Eat with your right hand.” The man said: “I cannot do that.” Thereupon he (the Prophet (sallallahu alayhi wa sallam)) said, “May you not be able to do that.” It was vanity that prevented him from doing it and he could not raise it (the right hand) up to his mouth afterwards.
Riyad as-Salihin 740, Book 3, The Book About the Etiquette of Eating, Hadith 14. 1 min read