'Law' in the Bible

And the king said to the wise men who knew the times (for so was the king's business conducted before all that knew law and judgment;

What shall be done to the queen Vashti according to law, because she has not performed the word of the king Ahasuerus by the chamberlains?

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

Go, gather together all the Jews that are found in Shushan, and fast 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.