Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says concerning the saying of Allah Almighty: "So mention the name of Allah over them when lined up" [Surah al-Hajj: 36] that (it means the animal should be) standing on three legs with one leg tied, and (while slaughtering one should say): 'Bismillahi wallahu akbar, Allahumma minka wa ilayk' "In the name of Allah, and Allah is the Greatest. O Allah, this is from You alone and (sacrificed) for You alone." This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.