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بِسْمِ اللَّهِ وَاللَّهُ أَكْبَرُ [اللَّهُمَّ مِنْكَ وَلَكَ] اللَّهُمَّ تَقَبَّلْ مِنِّي
(In the name of Allah, and Allah is the greatest. O Allah, (it is) from You and belongs to You, O Allah, accept this from me.)
Source: Muslim 3/1557, Al-Bayhaqi 9/287.