'Law of the Lord' in the Bible

(as it is written in the law of the Lord: Every male that opens the womb shall be called holy to the Lord;)

and to offer a sacrifice, according to that which is commanded in the law of the Lord: A pair of turtle doves, or two young pigeons.

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