ENOfficial
Abu Huraira reported God’s Messenger as saying, “He who has intercourse with his wife through her anus is accursed.” Ahmad and Abu Dawud transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَلْعُونٌ مَنْ أَتَى امْرَأَتَهُ فِي دُبُرِهَا» . رَوَاهُ أَحْمَدُ وَأَبُو دَاوُدَ
sunnah.com