Tafseer Ibn Kathir of AT TAUBAH [10]

لاَ يَرْقُبُونَ فِي مُؤْمِنٍ إِلاًّ وَلاَ ذِمَّةً وَأُوْلَـئِكَ هُمُ الْمُعْتَدُونَ

They do not observe toward a believer any pact of kinship or covenant of protection. And it is they who are the transgressors.