'Law of the Lord' in the Bible

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

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