When slaughtering or offering a sacrifice

بِسْمِ اللَّهِ وَاللَّهُ أَكْبَرُ [اللَّهُمَّ مِنْكَ وَلَكَ] اللَّهُمَّ تَقَبَّلْ مِنِّي

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

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