A tiny pre-existing morsel caught between the teeth is distinct from beginning to eat during prayer. The commentary distinguishes less than a chickpea from a chickpea-sized or larger amount; swallowing a meaningful food amount invalidates the prayer.
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Food particles already in the mouth
Disliked Acts in Prayer: Movement, Dress, Turning and Validity
A tiny pre-existing morsel caught between the teeth is distinct from beginning to eat during prayer. The commentary distinguishes less than a chickpea from a chickpea-sized or larger amount; swallowing a meaningful food amount invalidates the prayer.