In what event was this prophecy fulfilled?

Answer

"Now all this was done [the birth of Jesus of the Virgin Mary], that it might be fulfilled which was spoken
of the Lord by the prophet, saying, Behold, a virgin shall be with child, and shall bring forth a son, and
they shall call His name Emmanuel, which being interpreted is, God with us." Matt. 1: 22, 23.

Why did John write his testimony concerning God's love and purpose in giving Christ?
For what purpose is the mystery of the gospel made manifest?
For what purpose did Christ come into the world?
Where and by whom were the foundations of home laid?
How was the little horn to treat God's people?
How did Jesus answer them?
What directions were given by Constantine's Sunday law of March 7, 321?

Questions & Answers are from the book Bible Readings for the Home Circle