'Law of the Lord' in the Bible

(As it says in the law of the Lord, Every mother's first male child is to be holy to the Lord),

And to make an offering, as it is ordered in the law of the Lord, of two doves or other young birds.

And when they had done all the things which were ordered by the law of the Lord, they went back to Galilee, to Nazareth, the town where they were living.