Question:
As salamou ‘alaykoum Shaykh,who does not know if he has committed a disbelieve during the day for example. He doubts only, should it do the shahada as a precaution otherwise he is a kafir? Baraka l-Lâhou fikoum
Answer:
Alaykum Salam,
Lack of knowledge does not form knowledge of anything nor any proof. Therefore he is still a Muslim. However, one should always make istighfar and repeat shahada to strengthen oneself and seek refuge in Allah from the whisperings of shaytan.
Hajj Gibril Haddad