'Law of the Lord' in the Bible

as it is written in the law of the Lord: "Every firstborn male shall be called holy to the Lord,"

and to offer a sacrifice, according to what is directed 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.