What advice did Prophet Muhammad (peace be upon him) give about how one should conduct themselves if they believe in Allah and the Last Day?
 Narrated Abu Huraira:                     Allah's Apostle said, "Anybody who believes in Allah and the Last Day should not harm his neighbor, and anybody who believes in Allah and the Last Day should entertain his guest generously and anybody who believes in Allah and the Last Day should talk what is good or keep quiet. (i.e. abstain from all kinds of evil and dirty talk).