Matthew 1:20-21
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20But when he thought on these things, behold, an angel of the Lord appeared unto him in a dream, saying, Joseph, thou son of David, fear not to take unto thee Mary thy wife: for that which is conceived in her is of the Holy Spirit. 21And she shall bring forth a son; and thou shalt call his name JESUS; for it is he that shall save his people from their sins.
Matthew 1:20-21 (ASV)