Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
darimi:2967Muḥammad b. Yūsuf > Sufyān > Ismāʿīl b. Sumayʿ > a man > Ibn ʿAbbās

[Machine] "I wish that both I and those who disagree with me in seriousness would curse each other, so which of us is worse in speech."  

الدارمي:٢٩٦٧أَخْبَرَنَا مُحَمَّدُ بْنُ يُوسُفَ حَدَّثَنَا سُفْيَانُ عَنْ إِسْمَاعِيلَ بْنِ سُمَيْعٍ عَنْ رَجُلٍ عَنْ ابْنِ عَبَّاسٍ قَالَ

«لَوَدِدْتُ أَنِّي وَالَّذِينَ يُخَالِفُونَنِي فِي الْجَدِّ تَلَاعَنَّا أَيُّنَا أَسْوَأُ قَوْلًا»