What was in the Ark of the Covenant?

Only the two tables of Moses

There was nothing in the ark save the two tables of stone, which Moses put there at Horeb, when the LORD made a covenant with the children of Israel, when they came out of the land of Egypt. 1 Kings 8:9
There was nothing in the ark save the two tables which Moses put therein at Horeb, when the LORD made a covenant with the children of Israel, when they came out of Egypt. 2 Chronicles 5:10

The tables of Moses, a golden pot filled with manna, and Aaron's budded rod.

At least, that's what the author of Hebrews said.

The ark of the covenant overlaid round about with gold, wherein was the golden pot that had manna, and Aaron's rod that budded, and the tables of the covenant. Hebrews 9:4

Here's where he got the idea about the pot of mana.
(Although the passage says nothing about a gold pot.)

And Moses said, This is the thing which the LORD commandeth, Fill an omer of it to be kept for your generations; that they may see the bread wherewith I have fed you in the wilderness, when I brought you forth from the land of Egypt.
And Moses said unto Aaron, Take a pot, and put an omer full of manna therein, and lay it up before the LORD, to be kept for your generations.

As the LORD commanded Moses, so Aaron laid it up before the Testimony, to be kept. Exodus 16:32-34

And Aaron's blooming rod.

And the LORD said unto Moses, Bring Aaron's rod again before the testimony, to be kept for a token against the rebels; and thou shalt quite take away their murmurings from me, that they die not.
And Moses did so: as the LORD commanded him, so did he. Numbers 17:10-11

What was in the Ark of the Covenant?

Only the two tables of Moses

The tables of Moses, a golden pot filled with manna, and Aaron's budded rod.

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