'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 was come to go in to king Ahasuerus, after that it had been done to her according to the law for the women twelve months (for so were the days of their purifications accomplished, to wit , six months with oil of myrrh, and six months with sweet odors and with the things for the purifying of the women),

Go, gather together all the Jews that are present in Shushan, and fast ye for me, and neither eat nor drink three days, night or day: I also and my maidens will fast in like manner; and so will I go in unto the king, which is not according to the law: and if I perish, I perish.