Giving Salaam
Imran bin Husayn (RA) recounts that once he and others were in the presence of the Prophet (SallallÄhu 'alayhi wa sallam) when a man came and said, “Assalamu alaikum”, to which the Prophet (SallallÄhu 'alayhi wa sallam) responded and said, “Ten”, then another man came and he said “Assalamualaikum wa rahmatullah”, to which the Prophet (SallallÄhu 'alayhi wa sallam) responded and said “Twenty”. Finally, a third man came and said “Assalamu alaikum wa Rahmatullah wa Barakatu”, to which the Prophet (SallallÄhu 'alayhi wa sallam) responded and said, “Thirty”. (Abu Daud, Tirmidhi, Jami al Usul, p. 602. Vol 6)