'Law of the Lord' in the Bible

(as it is written in the law of the Lord, That every male that openeth the womb shall be called holy to the Lord:) and to offer a sacrifice,

according to what is required 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 into Galilee, to their own city Nazareth.