Ibn ‘Umar reported God’s Messenger as saying, "Avoid being naked, for with you are those who never leave you (the recording angels) except when you are relieving yourselves and when a man has intercourse with his wife; so observe modesty before them and honour them.” Tirmidhi transmitted it.

وَعَنِ ابْنِ عُمَرَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِيَّاكُمْ وَالتَّعَرِّيَ فَإِنَّ مَعَكُمْ مَنْ لَا يُفَارِقُكُمْ إِلَّا عِنْدَ الْغَائِطِ وَحِينَ يُفْضِي الرَّجُلُ إِلَى أَهْلِهِ فَاسْتَحْيُوهُمْ وَأَكْرِمُوهُمْ» . رَوَاهُ التِّرْمِذِيّ