Dua 1
بِسْمِ اللّٰهِ وَاللّٰهُ اَكْبَرُ [ اَللّٰهُمَّ مِنْكَ وَلَكَ] اَللّٰهُمَّ تَقَبَّلْ مِنْ [....]
(I slaughter) in the name of Allah, and Allah is the Greatest. O Allah! (This is) from You and for You. O Allah! Accept (it) from [....].
Where the Arabic above leaves a place for the names of those the sacrifice is from, the reciter says “minnee” (from me). If a person slaughters on his own behalf, he will say “minni”; but if someone slaughters on behalf of another, he will say “min” and then mention that person's name.
Sahih Muslim, no. (1966), which has the tasmiyah and takbir, Sahih Muslim no. (1967), which has the last sentence, Mustakhraj Abi Awanah, no. (7798), where the addition in square brackets is found, and its chain is sahih.
Some say that the words from “اَللّٰهُمَّ مِنْكَ وَلَكَ” to the end are not established, but that is completely wrong, because the last sentence “اَللّٰهُمَّ تَقَبَّلْ مِنْ” is established in another hadith of Sahih Muslim itself, no. (1967). As for the words “اَللّٰهُمَّ مِنْكَ وَلَكَ”, they too are established in Mustakhraj Abi Awanah no. (7798); in its chain Shu'bah narrates from Qatadah, and when Shu'bah narrates from Qatadah, Qatadah's 'an'anah is proof. Allamah al-Albani (RH) graded another narration with these words Hasan, [Ta'liq ala Hidayat ar-Ruwat (2/128) footnote no. (2)]
So it is clear that this narration is completely sahih, and for some to shut their eyes to the other routes and call it weak only on seeing al-Bayhaqi's chain is a great carelessness.
Note:- The author's book has “مِنِّيْ”; the “ya” is added by the author. If someone slaughters on his own behalf, he will say “minni”, that is, from me; but if someone slaughters on behalf of another, he will say “min” and then mention that person's name.