In this chapter of Jesus' birth and youth, we see the third and fourth of four hymns in Luke's Gospel: the Gloria in Excelsis of the heavenly host and the Nunc Dimittis of Simeon.
The most comprehensive of the four Gospels, Luke is a beautifully written book that documents the perfect humanity of Jesus and presents Him as the Son of Man who seeks and saves the lost.
Mark's Gospel moves quickly through the life of Jesus to the final week of His life, with an emphasis on His humanity (frequently referring to Him as the "Son of Man"). Service and sacrifice are major themes of Mark.
Genesis 21 describes the birth of Isaac, Abraham's growing faith, and the tension that develops between Sarah and Hagar (symbolizing the clash between law and grace).
Matthew 28 records the resurrection of Jesus and the Great Commission that Jesus left with His disciples before leaving earth and ascending into heaven.
Three men, including an angel of the Lord (a manifestation of the preincarnate Christ), delivers the news to Abraham and Sarah that they will soon have a son, Isaac, who is the son of the covenant promise God made earlier to Abraham.