"Whoever believes in ALLAH and the last day should talk what is good or keep quiet, and whoever believes in ALLAH and the last day should not hurt (or insult) his neighbour; and whoever believes in ALLAH and the last day, should entertain his guest generously"

i take from http://www.islamicthinking.info/post/5664325239/whoever-believes-in-allah-and-the-last-day-should.