"I used to serve the Prophet, and when he wanted to take a bath he would say: 'Turn your back to me.' So I would turn my back and hung up a cloth, and concealed him with it."  

كُنْتُ أَخْدُمُ النَّبِيَّ ﷺ فَكَانَ إِذَا أَرَادَ أَنْ يَغْتَسِلَ قَالَ وَلِّنِي فَأُوَلِّيهِ قَفَاىَ وَأَنْشُرُ الثَّوْبَ فَأَسْتُرُهُ بِهِ  

"I asked whether the Messenger of Allah prayed voluntary prayer when traveling, but I could not find anyone to tell me until Umm Hani' bint Abu Talib told me that he had come during the year of the Conquest (of Makkah). He ordered that a screen be held up, and that was done, and he took a bath; then he prayed eight Rak'ah (units) of voluntary prayer."  

أَنَّ رَسُولَ اللَّهِ ﷺ سَبَّحَ فِي سَفَرٍ حَتَّى أَخْبَرَتْنِي أُمُّ هَانِئٍ بِنْتُ أَبِي طَالِبٍ أَنَّهُ قَدِمَ عَامَ الْفَتْحِ فَأَمَرَ بِسِتْرٍ فَسُتِرَ عَلَيْهِ فَاغْتَسَلَ ثُمَّ سَبَّحَ ثَمَانِيَ رَكَعَاتٍ  

"The Messenger of Allah said: 'No one of you should bathe in open land or on a roof where he is not concealed; even if he does not see anyone, he can still be seen.'"  

قَالَ رَسُولُ اللَّهِ ﷺ لاَ يَغْتَسِلَنَّ أَحَدُكُمْ بِأَرْضِ فَلاَةٍ وَلاَ فَوْقَ سَطْحٍ لاَ يُوَارِيهِ فَإِنْ لَمْ يَكُنْ يَرَى فَإِنَّهُ يُرَى