What if a Muslim ate or drank out of forgetfulness?
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If one – out of forgetfulness or by mistake- had one of the things that annul his fasting, then his fasting is valid. This view is hold by most scholars. One must abstain from this prohibited matter once he remembers that he is fasting
Allah said ( interpretation of the meaning ) :
{ Allah intends for you ease and does not intend for you hardship }
AL‑BAQARAH (185)