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In page Visitation (Christianity):

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Mary stayed three months with Elizabeth (Luke 1:56), and most scholars hold she stayed for the birth of John.[citation needed] Given the prevailing cultural traditions and needs for security, it is probable that Joseph accompanied Mary to Judah then returned to Nazareth, and came again after three months to take his wife home. The apparition of the angel, mentioned in Matthew 1:19–25, may have taken place then to end the tormenting doubts of Joseph regarding Mary's maternity.[1]