'Law of the Lord' in the Bible

as it was written in the law of the Lord; That every male opening the womb shall be called holy to the Lord;

and to offer a sacrifice according to that which has been written in the law of the Lord, a pair of turtle-doves, or two young pigeons.

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