Hadith: Abu Hurairah Radiyallahu 'anhu narrates that Nabi Sallallahu 'alaihi wasallam said: If people sit in a gathering in which they do not do the Dhikr of Allah nor send Salawat on the Prophet, such a gathering becomes a cause of dismay and loss for them. If Allah wills. He will punish them and if He wills. He will forgive them. (Tirmidhi: 3380)