Sahih Muslim 2558 a
Abu Huraira reported that a person said:
Allah's Messenger, I have relatives with whom I try, to have close relationship, but they sever (this relation). I treat them well, but they treat me ill. I am sweet to them but they are harsh towards me. Upon this he (the Holy Prophet) said: If it is so as you say, then you in fact throw hot ashes (upon their faces) and there would always remain with you on behalf of Allah (an Angel to support you) who would keep you dominant over them so long as you adhere to this (path of righteousness).
حَدَّثَنِي مُحَمَّدُ بْنُ الْمُثَنَّى، وَمُحَمَّدُ بْنُ بَشَّارٍ، - وَاللَّفْظُ لاِبْنِ الْمُثَنَّى - قَالاَ حَدَّثَنَا 
 مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، قَالَ سَمِعْتُ الْعَلاَءَ بْنَ عَبْدِ الرَّحْمَنِ، يُحَدِّثُ عَنْ أَبِيهِ، عَنْ أَبِي،
 هُرَيْرَةَ أَنَّ رَجُلاً، قَالَ يَا رَسُولَ اللَّهِ إِنَّ لِي قَرَابَةً أَصِلُهُمْ وَيَقْطَعُونِي وَأُحْسِنُ إِلَيْهِمْ وَيُسِيئُونَ
 إِلَىَّ وَأَحْلُمُ عَنْهُمْ وَيَجْهَلُونَ عَلَىَّ ‏.‏ فَقَالَ ‏
"‏ لَئِنْ كُنْتَ كَمَا قُلْتَ فَكَأَنَّمَا تُسِفُّهُمُ الْمَلَّ وَلاَ يَزَالُ
 مَعَكَ مِنَ اللَّهِ ظَهِيرٌ عَلَيْهِمْ مَا دُمْتَ عَلَى ذَلِكَ ‏"‏ ‏.‏