What is the ruling on biting one's nails during prayer, along with citing hadiths as evidence for that?
Biting one's nails during prayer is reprehensible (makrooh) because it is a frivolous act (عبث) that diminishes solemnity (khushoo'). It may even invalidate the prayer if it is excessive, and the criterion for what constitutes an excessive act is common understanding and custom.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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