If he clearly says that he is going there for shirk, this is prohibited for you to assist him. But if he is going there to visit someone or he doesn’t tell you why, this is permissible.

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If such coins are not made of gold and silver and they are not in use anymore, this is permissible.

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Working in a conventional bank that deals with Riba is totally prohibited. One can work in an Islamic bank that actually operates on the basis of Sharia, you shouldn’t be fooled by just the name though. Kindly refer to the following link(s): https://youtu.be/lxjZICIj1cs

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