The Virgin Birth

"Before she was in labor, she brought forth; before her time came to be delivered, she brought forth a man child."
- Isaiah 66:7

This prophecy from Isaiah describes the birth of Christ: when He was born into the world, He did so in a way that left His mother's virginity intact.

Something like this miracle is repeated after the Resurrection, when Christ appears to His disciples after they have locked themselves in the upper room:

"Now when it was late the same day, the first of the week, and the doors were shut, where the disciples were gathered together, for fear of the Jews, Jesus came and stood in the midst..."
- John 20:19

Mary was always a Virgin -- to the ends of her days, Deo gratias.