violation of oaths

لَا يَرْقُبُونَ فِى مُؤْمِنٍ إِلًّا وَلَا ذِمَّةً ۚ وَأُو۟لَـٰٓئِكَ هُمُ ٱلْمُعْتَدُونَ

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