'It is Written' in the Bible

And so they caused it be declared and proclaimed in all their cities, and at Jerusalem, saying, "Go up unto the mount and fetch Olive branches, and Pine branches, Myrtle branches, Palm branches, and branches of thick trees, to make booths, as it is written."

And we cast the lot among the priests, Levites and the people, for offering of the wood to be brought unto the house of our God from year to year, after the houses of our fathers that it might be burnt at times appointed, upon the altar of the LORD our God, as it is written in the law:

and the firstlings of our sons, and of our cattle, as it is written in the law: and the firstlings of our oxen and of our sheep, that we should bring all this to the house of our God unto the priests that minister in the house of our God: