Is it permissible to move or sit in the place where someone has laid down a prayer mat (musalla)?

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It is permissible to lift a prayer mat placed by someone and sit in its location. This permissibility is based on the reasoning that a prayer mat possesses no inherent sanctity or special rights over the ground. Furthermore, precedence in prayer is established by the physical presence of the worshipper's body, not by the mat itself. Lifting the mat also prevents the owner from arriving late and subsequently needing to step over the necks of those already praying, which is discouraged.