The Prophet ﷺ said: There is no sin more fitted to have punishment meted out by Allah to its perpetrator in advance in this world along with what He stores up for him in the next world than oppression and severing ties of relationship. (Using translation from Abū Dāʾūd 4902)
قَالَ رَسُولُ اللَّهِ ﷺ «مَا مِنْ ذَنْبٍ أَجْدَرُ أَنْ تُعَجَّلَ لِصَاحِبِهِ الْعُقُوبَةُ فِي الدُّنْيَا مَعَ مَا يُدَّخَرُ لَهُ فِي الْآخِرَةِ مِنَ الْبَغِيِ وَقَطِيعَةِ الرَّحِمِ» صَحِيحُ الْإِسْنَادِ وَلَمْ يُخْرِجَاهُ صحيح