Bulugh al-Maram:Food:Hadith 1541
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.’