Muslim helping a non-Muslim against Muslims
Q: I know that if a Muslim helps a non Muslim against Muslims, he leaves the fold of Islam. What is the crieteria of help? For example if I have a non Muslim friend and I talk to her about a Muslim which may lead to physical or mental harm or loss of rights to the said Muslim, will that be kufr too? I used to daily think that this applied in case of war/weaponry only.