Matthew 1:19-20

19Because Joseph her husband was faithful to the law, and yet Or was a righteous man and did not want to expose her to public disgrace, he had in mind to divorce her quietly. 20But after he had considered this, an angel of the Lord appeared to him in a dream and said, “Joseph son of David, do not be afraid to take Mary home as your wife, because what is conceived in her is from the Holy Spirit.