If you need divorced for few years and want to remarry your ex wife. if she has not been with any man in this time, can she re marry her husband, or does she have to "be" with another man first.

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Surah Baqarah, verse 230
And if he has divorced her [for the third time], then she is not lawful to him afterward until [after] she marries a husband other than him. And if the latter husband divorces her [or dies], there is no blame upon the woman and her former husband for returning to each other if they think that they can keep [within] the limits of Allah . These are the limits of Allah, which He makes clear to a people who know.