Quote  Category: Qur'an “A Muslim has five duties towards another Muslim; to return a salutation, visit the sick, follow funerals, accept an invitation and say 'God have mercy on you' when one sneezes.” - Prophet Muhammad (570-632) Sayings of Muhammad. by Prof. Ghazi Ahmad - Arabian, b. Mecca, son of Abdallah, descended of Ishmael. Email this quote to a friend! If there is an error in this quote please let us know. Famous Quotes © ® All rights reserved.