'Law of the Lord' in the Bible

as it is written in the law of the Lord, Every male child, that openeth the womb, shall be called holy to the Lord;

and to offer a sacrifice, according to what is prescribed in the law of the Lord, A pair of turtle doves, or two young pigeons.

And when they had finished all things according to the law of the Lord, they returned into Galilee, into their own city Nazareth.