Exodus 25:16 "You shall put into the ark the testimony which I shall give you.

Exodus 25:21 "You shall put the mercy seat on top of the ark, and in the ark you shall put the testimony which I will give to you.

Exodus 27:21 "In the tent of meeting, outside the veil which is before the testimony, Aaron and his sons shall keep it in order from evening to morning before the LORD; it shall be a perpetual statute throughout their generations for the sons of Israel.

Exodus 40:20 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.

Numbers 17:10 But the LORD said to Moses, "Put back the rod of Aaron before the testimony to be kept as a sign against the rebels, that you may put an end to their grumblings against Me, so that they will not die." (NASB ©1995)