Mr. Nadvi, can you please show a single evidence from Quran that it is forbidden. Or is there any body else whose word is same as Allah? "And of men is he who takes instead frivolous discourse to lead astray from Allah's path without knowledge, and to take it for a mockery; these shall have an abasing chastisement." Luqman 6

কুম তো বহুবচন।তো আমরা একজনের সালামের সময় ও বহুবচন কুম কেন বলি?