What is the ruling if it is impossible or overly difficult to travel with all wives?

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If accompanying all wives during the journey is not possible or causes undue hardship, it is permissible to send them all together with another man who is a lawful mahram (unmarriageable kin) to them. In this case, maintenance is not due to any of the wives based on the travel arrangements, and no casting of lots (*qur'ah*) is required because equity has been maintained among them.