An angel came down and told him that he was going to have a son that would be powerful. And he dreamed it too.
The Bible doesn't say how he found out, but the angel came to reassure him that Mary was not immoral. He already knew by then about her pregnancy because he was considering not marrying her.
Marry her to keep her from being stoned to death. Jewish women are supposed to be virgin on the day of her marriage.
Matthew makes this clear in the following verses. Joseph intended effectively to have a 'quiet divorce' since Mary was effectively already considered to be his wife. He did not wish her to get into trouble although one wonders how he really would have achieved this in that society.
Matthew 1:18-2018Now the birth of Jesus Christ was on this wise: When as his mother Mary was espoused to Joseph, before they came together, she was found with child of the Holy Ghost.19Then Joseph her husband, being a just man, and not willing to make her a public example, was minded to put her away privily.
20But while he thought on these things, behold, the 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 Ghost.
Joseph's reaction was to quietly end his betrothal to Mary (which was as binding as marriage) in order to avoid publicly shaming her. An angelic messenger from God warned him against doing this, reassuring him that she had not been unfaithful.
Matthew 1:20 will answer your question. "But while he thought on these things, behold, the 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 Ghost".
Accoding to the Catholic, Eastern Orthadox, oriental Orthadox, Greek Orthadox, and Episcapol Churches the archangel Gabriel cambodily to Mary and told her.
According to many of the protestant churches and the Islamic faith, the angel Gabriel told her. Though of cource in the protestant faiths Gabriel says that God or the Son of God that she is carrying while in Islam Gabriel calls him a profit.
the bible sys when Joseph found out about Mary''s pregnancy, he had a mind or some thougths of divorcing her privately without making her ashamed as he was a righteos man. This means he wanted to divorce his wife as he thought that she had cheated on him. The angel of the Lord then appeared to him in the night in his dream telling him the truth and even gave him instructions on what to do. Joseph the righteous man then obeyed and did not divorce his wife.
The Bible doesn't say, but they may or may not have met face to face. Arranged marriages were normal in those times.
Joseph and Mary were not married as yet.
Nazareth
There is no biblical texts which I am aware of, that identify the first meeting of Joseph and Mary. You will find Josephs account written in the early chapters of Matthew and Mary's account written in the early chapters of the book of Luke.
Joseph and Mary were the parents of Jesus of Nazareth.
Mary rode on a donkey, and Joseph walked
Mary Joseph Butler was born in 1641.
Mary Joseph Butler died in 1723.
Joseph and Mary recognized Jesus in the temple.
The question is not clear. Joseph was Mary s husband.
Both Joseph and Mary lived in Nazareth in the Roman period, and when king Herod was the ruler.
Mary and Joseph were Jewish the same with their son Jesus.
Mary and Joseph thought Jesus was with their friends.
Edward Mary Joseph Molyneux died in 1913.