What to say when slaughtering or sacrificing an animal

 

246. Bismillaahi wallaahu 'Akbar [Allaahumma minka wa laka] Allaahumma taqabbal minnee.

With the Name of Allah, Allah is the Most Great! [O Allah, from You and to You.] O Allah, accept it from me.

Reference: Muslim 3/ 1557, Al-Bayhaqi 9/287.