And when the time came for their purification according to the Law of Moses, they brought him up to Jerusalem to present him to the Lord (as it is written in the Law of the Lord, “Every male who first opens the womb shall be called holy to the Lord”) and to offer a sacrifice according to what is said in the Law of the Lord,

So what is this presentation of the first born son at the temple and how does it relate to the law of God?