Musnad Ahmad 830:26

Isma'il narrated to us, 'Uyaynah ibn 'Abd al-Rahman informed us, from his father, from Abu Bakrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "There is no sin more deserving that Allah should hasten the punishment for its perpetrator in this world, along with what He stores up for him in the Hereafter, than oppression and severing ties of kinship."