Your Lord is bountiful to mankind: yet most of them do not give thanks.
They know the outward shows of this life present but of the next life are they careless. Have they not consider the heavens and the earth and all that is between them but for a serious end, and for a fixed term? But truly most men believe not that they shall meet their Lord.
By God ye shall be called to account for your doings!
... and we will test you with evil and with good; and unto us shall ye be brought back.
Reviling a Muslim is disobedience to God, and fighting with him is infidelity.