Deuteronomy 31:9-11

And Moses wrote this law, and delivered it unto the priests the sons of Levi, that bare the ark of the covenant of Jehovah, and unto all the elders of Israel. And Moses commanded them, saying, At the end of every seven years, in the set time of the year of release, in the feast of tabernacles, when all Israel is come to appear before Jehovah thy God in the place which he shall choose, thou shalt read this law before all Israel in their hearing.