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When slaughtering or offering a sacrifice:
بِسْمِ اللَّهِ وَاللَّهُ أَكْبَرُ، [اللَّهُمَّ مِنْكَ وَلَكَ]، اللَّهُمَّ تَقَبَّلْ مِنِّي
Bismillahi wallahu akbar, Allahumma minka walak, Allahumma taqabbal minni
In the name of Allah, and Allah is the Greatest. [O Allah, it is from You and for You.] O Allah, accept it from me.
Source Ṣaḥīḥ Muslim, The Book of Sacrifices — site no. 4954 (similar wording) Ṣaḥīḥ · Ṣaḥīḥ Muslim, The Book of Sacrifices — site no. 4955 Ṣaḥīḥ · Sunan Abī Dāwūd 2795 (similar wording) Ḍaʿīf
Compiler cites Muslim 3/1557; al-Bayhaqī 9/287; the bracketed words are al-Bayhaqī's addition, and the last sentence is reported in meaning from Muslim