The Bismi'llah saying, "in the Name of Allah," that invokes a blessing upon an action or undertaking of a Muslim. The full form is bismillahi (ar-)rahmani (ar-)rahim, "in the Name of Allah the merciful the compassionate."
literally the phrase, Bismillah Rehman Rahim "In the name of Allah, the Most Kind, the Most Mericful." This utterance is usually made by every Muslim who is about to embark on something lawful (Halal), regardless of the magnitude of the task. This is also the first verse of Surah Al-Fatehah (Chapter 1) of the Holy Quran. Insha Allah ; "If Allah wills."