'According to the Law' in the Bible

And the drinking was according to the law, no one compelling, for so the king had commanded every chief of his house that they should do according to every man's pleasure.

And when the turn of each young woman had come to go in to King Ahasuerus, after she had been purified twelve months, according to the law of the women (for so the days of their anointing were done, six months with oil of myrrh, and six months with sweet odors, and with the perfumes of the women).

Go, gather all the Jews who are present in Shushan, and fast for me, and do not eat nor drink three days, night or day. My maidservants and I will also fast in the same way. And so I will go in to the king, which is not according to the law. And if I perish, I perish.