'Law' in the Bible

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

Then the king said to the wise men, which knew the times, (for so was the king's manner toward all that knew law and judgment:

What shall we do unto the queen Vashti according to law, because she hath not performed the commandment of the king Ahasuerus by the chamberlains?

All the king's servants, and the people of the king's provinces, do know, that whosoever, whether man or woman, shall come unto the king into the inner court, who is not called, there is one law of his to put him to death, except such to whom the king shall hold out the golden sceptre, that he may live: but I have not been called to come in unto the king these thirty days.

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 likewise; and so will I go in unto the king, which is not according to the law: and if I perish, I perish.