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Slaughtering/sacrificing an animal:

بِسْمِ اللهِ واللهُ أَكْبَرُ اللَّهُمَّ مِنْكَ ولَكَ اللَّهُمَّ تَقَبَّلْ مِنِّي

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.

Muslim 3/1557, Al-Bayhaqi 9/287

[Source: Hisn al Muslim, dar-us-salam Publication]

Related Links: http://abdurrahman.org/category/islam/animal-sacrifice/