(10) باب مَا يَسْتُرُ مِنَ الْعَوْرَةِ
Narrated Abu Sa`id Al-Khudri:
Allah's Messenger (ﷺ) forbade Ishtimal-As-Samma' (wrapping one's body with a garment so that one cannot raise its end or take one's hand out of it). He also forbade Al-Ihtiba' (sitting on buttocks with knees close to `Abdomen and feet apart with the hands circling the knees) while wrapping oneself with a single garment, without having a part of it over the private parts.
Reference: Sahih al-Bukhari 367
In-book reference: Book 8, Hadith 19
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 8, Hadith 363