Exodus 25:16

16 Then put in the ark the tablets of the covenant law, which I will give you.

Read Exodus 25:16 Using Other Translations

And thou shalt put into the ark the testimony which I shall give thee.
And you shall put into the ark the testimony that I shall give you.
When the Ark is finished, place inside it the stone tablets inscribed with the terms of the covenant, which I will give to you.