Muwatta Malik, Book 9, Hadith 375 (In-Book) ⓘ
Yahya related to me from Malik from Hisham ibn Urwa that his father used to pray in the desert without a sutra.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، أَنَّ أَبَاهُ، كَانَ يُصَلِّي فِي الصَّحْرَاءِ إِلَى غَيْرِ سُتْرَةٍ .
also referenced under: Book 9, Hadith 44 (USC-MSA)