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'Iyad ibn Himar said, "I said, 'Messenger of Allah, there is someone who reviles me.' The Prophet, may Allah bless him and grant him peace, said, 'Those who revile one another are two shaytans who accuse one another and deny one another.'"
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عَمْرُو بْنُ مَرْزُوقٍ، قَالَ: أَخْبَرَنَا عِمْرَانُ، عَنْ قَتَادَةَ، عَنْ يَزِيدَ بْنِ عَبْدِ اللهِ بْنِ الشِّخِّيرِ، عَنْ عِيَاضِ بْنِ حِمَارٍ قَالَ: قُلْتُ: يَا رَسُولَ اللهِ، الرَّجُلُ يَسُبُّنِي؟ قَالَ النَّبِيُّ صلى الله عليه وسلم: الْمُسْتَبَّانِ شَيْطَانَانِ يَتَهَاتَرَانِ وَيَتَكَاذَبَانِ.
sunnah.com