Ambrose of Milan
Catena Aurea · Lukasevangelium 1
And Mary arose in those days, and went into the hill country with haste, into a city of Juda; And entered into the house of Zacharias, and saluted Elisabeth. And it came to pass, that, when Elisabeth heard the salutation of Mary, the babe leaped in her womb; and Elisabeth was filled with the Holy Ghost: And she spake out with a loud voice, and said, Blessed art thou among women, and blessed is the fruit of thy womb. And whence is this to me, that the mother of my Lord should come to me? For, lo, as soon as the voice of thy salutation sounded in my ears, the babe leaped in my womb for joy. And blessed is she that believed: for there shall be a performance of those things which were told her from the Lord.
She says it not ignorantly, for she knew it was by the grace and operation of the Holy Spirit that the mother of the prophet should be saluted by the mother of his Lord, to the advancement and growth of her own pledge; but being aware that this was of no human deserving, but a gift of Divine grace, she therefore says, Whence is this to me, that is, By what right of mine, by what that I have done, for what good deeds?