At-Taubah - 9:10

لاَ يَرْقُبُونَ فِي مُؤْمِنٍ إِلاًّ وَلاَ ذِمَّةً وَأُوْلَـئِكَ هُمُ الْمُعْتَدُونَ
[9:10]
They do not pay regard to ties of relationship nor those of covenant in the case of a believer; and these are they who go beyond the limits.
In a Believer they respect not the ties either of kinship or of covenant! It is they who have transgressed all bounds.
And they observe toward a believer neither pact nor honour. These are they who are transgressors.