'According to the Law' in the Bible

And the drinking was according to the law, none could compel. For so the king had appointed to all the officers of his house, that they should do according to every man's pleasure.

Now when the turn of every maiden came to go in to king Ahasuerus, after it had been done to her according to the law for the women twelve months (for so were the days of their purifications accomplished, [namely], six months with