Quran 9:10

لَا يَرۡقُبُونَ فِى مُؤۡمِنٍ إِلاًّ۬ وَلَا ذِمَّةً۬‌ۚ وَأُوْلَـٰٓٮِٕكَ هُمُ ٱلۡمُعۡتَدُونَ ١٠

They never observe any rights of kinship towards any believer, nor do they uphold their covenants; these are the real transgressors.