'Regulation' in the Bible

Then he cried out to the Lord, and the Lord showed him a tree; and he threw it into the waters, and the waters became sweet.There He made for them a statute and regulation, and there He tested them.

For there was a commandment from the king concerning them and a firm regulation for the song leaders day by day.

the Jews established and made a custom for themselves and for their descendants and for all those who allied themselves with them, so that they would not fail to celebrate these two days according to their regulation and according to their appointed time annually.