Sunnah.com reference : Book 8, Hadith 57English translation : Book 8, Hadith 1024Arabic reference : Book 8, Hadith 1014
Narrated Ibn 'Abbas (RA):
Allah's Messenger (ﷺ) said: "Allah will not look at a man who has intercourse with a man or a woman through the anus."

[Reported by at-Tirmidhi, an-Nasa'i and Ibn Hibban, but it was considered to be defective for being Mawquf (saying of a Companion, i.e. Ibn 'Abbas)].
وَعَنِ ابْنِ عَبَّاسٍ ‏- رَضِيَ اَللَّهُ عَنْهُمَا‏- قَالَ : قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ لَا يَنْظُرُ اَللَّهُ إِلَى رَجُلٍ أَتَى رَجُلاً أَوْ اِمْرَأَةً فِي دُبُرِهَا }  رَوَاهُ اَلتِّرْمِذِيُّ , وَالنَّسَائِيُّ , وَابْنُ حِبَّانَ , وَأُعِلَّ بِالْوَقْفِ  1‏ .‏‏1 ‏- صحيح بشواهده.‏