Before a Muslim starts praying, he can place something in front of him to conceal him from people so that the reward of his prayer is not reduced by their passing in front of him. When he starts communication with his Lord, he should lightly repel anyone who wishes to pass in front of him. If that person is not repelled with ease, this means he has violated the limits and become an aggressor. In this case, it is permissible to push him away and stop his aggression by force. Passing in front of the praying person belongs to the deeds of the devils who wish to spoil people's acts of worship and confuse them during their prayer.