'According to the Law' in the Bible

And verily they that are of the sons of Levi, who receive the office of the priesthood, have a commandment to take tithes from the people according to the law, that is, from their brethren, though they come from the loins of Abraham:

For if he were on earth, he would not be a priest, seeing there are priests that offer gifts according to the law:

For when Moses had spoken every precept to all the people according to the law, he took the blood of calves and of goats, with water, and scarlet wool, and hyssop, and sprinkled both the book and all the people,