فمحمول على من كان في صلاة النافلة وقد قرأ من السورة الاخرى بعضها ويريد أن يقرأ باقيها فحينئذ لا يقرأ بسم الله الرحمن الرحيم والذي يبين ذلك ما رواه
So this is to be interpreted as referring to someone who is in a ‘nafila’ (supererogatory) prayer and has already recited part of another Surah and intends to continue the rest of it, in that case, he does not recite ‘Bismillah Hir Rahman Nir Rahim’. What clarifies this is what has been narrated:
