Law: Preserved in the Ark of the Covenant
Source: Nav
Exodus 25:16
And place inside the ark the Testimony, which I will give you.
Deuteronomy 31:9, 26
So Moses wrote down this law and gave it to the priests, the sons of Levi, who carried the ark of the covenant of the LORD, and to all the elders of Israel. / “Take this Book of the Law and place it beside the ark of the covenant of the LORD your God, so that it may remain there as a witness against you.