When slaughtering or sacrificing an animal

بِسْمِ اللّٰهِ وَاللّٰهُ أَكْبَرُ [اَللّٰهُمَّ مِنْكَ وَلَكَ] اَللّٰهُمَّ تَقَبَّلْ مِنِّيْ

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

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