
,
On the authority of Abdullah ibn Masood that the Messenger of Allah (saw) said: Abusing a Muslim is an outrage(insult , offend) and fighting against him is unbelief. (Muslim 122/Chapter Faith)
It sheds a good deal of light on how much restraint a Muslim is required to exercise on his tongue and hand

. It is indeed an enormous crime to use insulting language for a Muslim and unbelief to fight against him

. Our Prophet(saw) showed us the importance of love, fellow feeling in the Muslim society and the horrors of those acts which undermine the solidarity of the ummah
. These things are not permitted even against non muslims. Their life and honour are also to be respected and regarded.
wa salaam