Exodus 25:21

After you put into the ark the words of my covenant that I will give you, place the throne of mercy on top.

Exodus 26:34

Place the mercy seat on the Ark of the Covenant in the holy of holies.

Exodus 25:16-17

I will give you the Ten Commandments written on two flat tablets. Put them inside the chest.

Romans 10:4

Christ is the end of the law for righteousness to everyone who exerts active faith.

Treasury of Scripture Knowledge

Summary

And thou shalt put the mercy seat above upon the ark; and in the ark thou shalt put the testimony that I shall give thee.

Bible References

Mercy seat

Exodus 25:17
Cover the lid of the chest (mercy seat) with pure gold.
Exodus 26:34
Place the mercy seat on the Ark of the Covenant in the holy of holies.
Romans 10:4
Christ is the end of the law for righteousness to everyone who exerts active faith.

In

Exodus 25:16
I will give you the Ten Commandments written on two flat tablets. Put them inside the chest.

General references

Exodus 16:34
Aaron placed it before the Testimony, to be kept just as Jehovah commanded Moses.
Exodus 37:6
He made a lid of pure gold, forty-five inches long and twenty-seven inches wide.
Revelation 15:5
After that I noticed the temple of the sanctuary of the tent of witness was opened in heaven.