Matthew 1:20-21

20but while he pondered on these things, behold, an angel of [the] Lord appeared to him in a dream, saying, Joseph, son of David, fear not to take to [thee] Mary, thy wife, for that which is begotten in her is of [the] Holy Spirit.

21And she shall bring forth a son, and thou shalt call his name Jesus, for he shall save his people from their sins.