Exodus 34:1; 40:20

Now the Lord said to Moses, “Cut out for yourself two stone tablets like the former ones, and I will write on the tablets the words that were on the former tablets which you shattered.
- Exodus 34:1

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Then he took the testimony and put it into the ark, and attached the poles to the ark, and put the mercy seat on top of the ark.
- Exodus 40:20