بِسْمِ اللَّهِ وَاللَّهُ أَكْبَرُ اَللَّهُمَّ إِنَّ هَذَا مِنْكَ وَلَكَ اَللَّهُمَّ تَقَبَّلْ مِنِّي

Bismillaahi wallaahu akbar, allaahumma inna haadha minka walak, allaahumma taqabbal minni.

I am sacrificing with the name of Allah. And Allah is the Greatest. O Allah! It's from you and for you. O Allah! Please accept it from me. If it is on behalf of the family, then Wamin Ahli Baiti will be added after ‘Takbabbal Minni’. If the sacrifice is from someone else or if it is an Akika animal, take the name of that person or child after ‘Takabbal Min’. It is clear that no additional Dua on this subject is authentic.

Reference: Irwa'ul-Ghalil: 1118