Bede the Venerable
Catena Aurea · Lukasevangelium 2
And when the days of her purification according to the law of Moses were accomplished, they brought him to Jerusalem, to present him to the Lord; (As it is written in the law of the Lord, Every male that openeth the womb shall be called holy to the Lord;) 24 And to offer a sacrifice according to that which is said in the law of the Lord, A pair of turtledoves, or two young pigeons. And, behold, there was a man in Jerusalem, whose name was Simeon; and the same man was just and devout, waiting for the consolation of Israel; and the Holy Ghost was upon him.
Or the pigeon which flies in flocks sets forth the busy intercourse of active life. The turtle, which delights in solitariness, tells of the lofty heights of the contemplative life. But because each victim is equally accepted by the Creator, St. Luke has purposely omitted whether the turtles or young pigeons were offered for the Lord, that he might not prefer one mode of life before another, but teach that both ought to be followed.