Kindly advise the ruling of eating non halal food by mistake. how can one cleanse oneself? and in a situation where you dont know a place, can you consume non halal food since it's a new place and you dont know the halal places in that particular town or city..

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If it is by mistake ask for forgiveness sincerely and be careful next time.
As for if you don’t know the halal places then you must avoid all the meat and chicken.