إِذَا أَكَلَ أَحَدُكُمْ، فَلْيَأْكُلْ بِيَمِينِهِ، وَإِذَا شَرِبَ، فَلْيَشْرَبْ بِيَمِينِهِ
Translation: When one of you eats, let them eat with the right hand; and when they drink, let them drink with the right hand.
Source: مسلم
أَكَلَ means “ate” and شَرِبَ “drank.” فَلْيَأْكُلْ and فَلْيَشْرَبْ contain the instructive lām of command. بِيَمِينِهِ means “with their right hand.”
Dining etiquette includes cleanliness, attention, and the use of the right hand. A person with physical limitations should be treated considerately; teaching manners is not an excuse to embarrass or shame someone.