Ark of the Covenant: The Pot of Manna and Aaron's Rod Laid up Before

…containing the golden altar of incense and the gold-covered ark of the covenant. Inside the ark were the gold jar of manna, Aaron’s staff that had budded, and the stone tablets of the covenant.

So Moses told Aaron, “Take a jar and fill it with an omer of manna. Then place it before the LORD to be preserved for the generations to come.”

And Aaron placed it in front of the Testimony, to be preserved just as the LORD had commanded Moses.

The LORD said to Moses, “Put Aaron’s staff back in front of the Testimony, to be kept as a sign for the rebellious, so that you may put an end to their grumbling against Me, lest they die.”