Disliked acts include fidgeting and improper posture. Exceptions include a necessary single ground adjustment and physically excused sitting. Verbal greetings and eating or drinking affect validity; turning away from the qiblah raises another validity issue.
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Summary of the legal classifications
Disliked Acts in Prayer: Movement, Dress, Turning and Validity
Disliked acts include fidgeting and improper posture. Exceptions include a necessary single ground adjustment and physically excused sitting. Verbal greetings and eating or drinking affect validity; turning away from the qiblah raises another validity issue.