Bismillah being divinely revealed

Q: Is it true that basmala was divinely revealed by Allah Ta'ala to Nabi (sallallahu alaihi wasallam) (except in surah naml where it is a verse) and whoever doubts that it might not have been revealed by Allah Ta'ala is a kaafir? I am not talking about the bismillahir rahmanir raheem being a Quraanic verse or part of Quraan, but were those words divinely revealed by Allah Ta'ala and is there tawatur on that?