Al-Adab Al-Mufrad, Book 1, Hadith 29 (English) ⓘ

Abu Bakra reported that the Prophet, may Allah bless him and grant him peace, said, "There is no wrong action more likely to bring punishment in this world in addition to what is stored up in the Next World than oppression and severing ties of kinship."

حَدَّثَنَا عَبْدُ اللهِ بْنُ يَزِيدَ، قَالَ‏:‏ حَدَّثَنَا عُيَيْنَةُ بْنُ عَبْدِ الرَّحْمَنِ، عَنْ أَبِيهِ، عَنْ أَبِي بَكْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ‏:‏ مَا مِنْ ذَنْبٍ أَجْدَرُ أَنْ يُعَجَّلَ لِصَاحِبِهِ الْعُقُوبَةُ مَعَ مَا يُدَّخَرُ لَهُ، مِنَ الْبَغِيِّ وَقَطِيعَةِ الرَّحِمِ.