'According to the Law' in the Bible

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

And verily those children of Levi, which receive the office of the priests, have a commandment to take according to the law, tithes of the people, that is to say, of their brethren, yea though they sprung out of the loins of Abraham.

For he were not a priest, if he were on the earth where are priests that according to the law offer gifts,