Sahih Bukhari
Pilgrimmage (Hajj)
Volume: 002 / Book Number: 026 / Hadith Number: 771
Narrated Zaid bin Jubair:
I saw Ibn 'Umar passing by a man who had made his Badana sit to slaughter it. Ibn 'Umar said, "Slaughter it while it is standing with one leg tied up as is the tradition of Muhammad."