Does re-swallowing saliva that has exited the mouth due to illness invalidate the fast?
"Fasting is not invalidated by swallowing saliva if it remains inside the mouth and does not exit it, even if done intentionally. However, intentionally swallowing saliva after it has exited to the outer part of the lips does invalidate the fast."
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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