Sayyīdunā Imām Fakhruddīn Rāzī – says, ‘Whoever  writeson the entrance door (main gate) bismillahirahma nirraheemof his house gets secured from destruction, even if he is a disbeliever (only in this world). So how high would be the excellence of that Muslim who has inscribed it on his heart’s
tablet forever!’ (Tafsīr Kabīr, pp. 152, vol. 1)

Bismillah ar-rahman ar-rahim: “In (or with) the name of Allah, the Beneficent, the Merciful.”

Not only does the Holy Quran begin with this verse, but it also heads every chapter of the Quran, except for Chapter 9. This verse is a part of the Quranic revelation and through which the Holy Prophet distinguished the separation of the various chapters. In short, this verse keeps on recurring and possesses such depth that it has been said that just as the Fatihah (the first chapter of the Quran) summarizes the entire Holy Quran so does this verse summarize the Fatihah. In other words this verse is the summary of the summary of the Quran. Therefore, I will make a general commentary on this verse, so that it will not be necessary to comment on this verse at the beginning of every chapter. It may be noted, however, that like the daily sun, this verse too shines with a new splendour and power at the beginning of each chapter of the Quran.