What is the distance beyond which a person is not sinning if he passes in front of one who is praying?

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Check below answers in case you are looking for other related questions:
Should a traveller pray Sunnah?
The ruling on clasping the hands when praying

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Covering the head during prayer
Sitting briefly to rest during prayer is Sunnah and mustahabb
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Should a traveller pray Sunnah?
The ruling on clasping the hands when praying

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