What is the ruling on transporting all wives when relocating to another country?

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If a man is able to take all his wives with him when traveling to another country, he must do so. It is not permissible for him to single out one wife for travel. This is because the journey pertains to all wives collectively, requiring their joint transportation. Should he single out one, he must fulfill the rights of the remaining wives as if he were resident with them (i.e., providing their due maintenance).