'As Salaamu Alaikum' and the Prophet () said: 'ten'. Another passed by them and said: 'Assalaamu Alaikum wa rahmatu'laah’ and the Prophet () said: 'twenty'. Another passed by and said: 'Assalamu Alaikum wa rahmatulllahi wa barakotoho' and he () said thirty.’ (Bukhari) *It is not praiseworthy for one to greet another by saying: 'Alaikum as-Salaam' for the Prophet () said:
'Do not greet another by saying: 'Alaikum as salaam', for this is the greeting one greets the dead with.'(Abu Dawood)
*It is praiseworthy to repeat the Salam three times if the gathering is large and you are unsure if all have heard the greeting properly. The Messenger of Allah () would repeat the Salam three times. (Abu Dawood)