The first half of the Hail Mary is straight out of the Bible. The part before the semicolon (in the text below) is the angel Gabriel’s greeting to the Virgin Mary at the Annunciation, when he told her that she had been chosen by God to bear his Son, Jesus Christ (Luke 1,28). The words immediately following the semi-colon were uttered by Saint Elizabeth, the cousin of the Blessed Virgin, when Mary came to visit her. Saint Elizabeth felt Saint John the Baptist leap in her womb (Luke 1,42). The second half of the prayer is an invocation to the Mother of God from the depths of the heart. Since she is the Mother of God, she always hears our prayers.

Here is the prayer:

Hail Mary, full of grace! the Lord is with thee;
blessed art thou among women,
and blessed is the fruit of thy womb, Jesus.
Holy Mary, Mother of God,
pray for us sinners,
now and at the hour of our death. Amen.