'Abdullah ibn 'Amr ibn al-'As said, "A liar is someone who lies
in his oath. A miser is someone who is miserly with the greeting. A thief
is someone who steals the prayer."
Abu Hurayra said, "The most miserly of people is the one who is
miserly with the greeting. The most incapable of people of people is the
one who is the most incapable of supplication."