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وَفِي لَفْظٍ لِمُسْلِمٍ, وَيَقُولُ: { بِسْمِ اَللَّهِ. وَاَللَّهُ أَكْبَرُ } (1765) .4 - مسلم ( 1966 ) ( ج 3 / ص 1557 ).
In a version by Muslim, 'and would say Bismillah and Allahu Akbar.'
English reference:
Book 12, Hadith 1387
Arabic reference:
Book 12, Hadith 1346