(50) باب الصَّلاَةِ فِي مَوَاضِعِ الإِبِلِ
Narrated Nafi`:
"I saw Ibn `Umar praying while taking his camel as a Sutra in front of him and he said, "I saw the Prophet doing the same."
Reference: Sahih al-Bukhari 430
In-book reference: Book 8, Hadith 80
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 8, Hadith 422