Matthew 1:25

Overview - Matthew 1
1	The genealogy of Christ from Abraham to Joseph.
18	He is miraculously conceived of the Holy Ghost by the Virgin Mary, when she was espoused to Joseph.
19	The angel satisfies the doubts of Joseph, and declares the names and office of Christ: Jesus is born.

Matthew 1:25  (King James Version)
And knew her not till she had brought forth her firstborn son: and he called his name JESUS.