'It is Written' in the Bible

Then stood up Jeshua the son of Jozadak, and his brethren the priests, and Zerubbabel the son of Shealtiel, and his brethren, and built the altar of the God of Israel, to offer burnt-offerings on it as it is written in the law of Moses the man of God.

They kept also the feast of tabernacles, as it is written, and offered the daily burnt-offerings by number, according to the custom, as the duty of every day required;

And they set the priests in their divisions, and the Levites in their courses, for the service of God, who is at Jerusalem; as it is written in the book of Moses.