ما حكم من شرب ناسياً وهو صائم في غير رمضان؟

The preponderant view is that if a fasting person eats or drinks forgetfully, their fast remains valid, based on the Prophet's (PBUH) saying: "Whoever forgets while fasting and eats or drinks, let him complete his fast, for it was Allah who fed him and gave him drink." This ruling applies to all types of fasting, both obligatory and voluntary.