Luke 1:46–55 is both a beautiful hymn sung to glorify God and an interpretive puzzle. This text, widely known as the Magnificat, is one of several songs Luke uses at a crucial moment in the birth narratives in order for characters to explain the amazing ways in which God is moving. Luke includes it in his narrative to foreshadow the ministry of reversal Jesus will bring, first to Israel and eventually to all people. It is a praise hymn made up of a combination of OT allusions—more specifically, allusions to the Greek translation of the OT commonly referred as the Septuagint and abbreviated LXX. What follows is a study of the LXX allusions that combine to make up this praise hymn—allusions which have the cumulative effect of presenting Mary as a key character in the continuation of God’s OT promises and plan.