Exodus 26:34

You shall put the mercy seat on the ark of the testimony in the most holy place.

Exodus 25:21

You shall put the mercy seat on top of the ark, and in the ark you shall put the testimony that I will give you.

Exodus 40:20

He took and put the testimony into the ark, and set the poles on the ark, and put the mercy seat above on the ark.

Hebrews 9:5

and above it cherubim of glory overshadowing the mercy seat, of which things we can't speak now in detail.

Treasury of Scripture Knowledge

Summary

And thou shalt put the mercy seat upon the ark of the testimony in the most holy place.

General references

Bible References

Put the mercy seat

Exodus 25:21
You shall put the mercy seat on top of the ark, and in the ark you shall put the testimony that I will give you.
Exodus 40:20
He took and put the testimony into the ark, and set the poles on the ark, and put the mercy seat above on the ark.
Hebrews 9:5
and above it cherubim of glory overshadowing the mercy seat, of which things we can't speak now in detail.

General references

Exodus 40:3
You shall put the ark of the testimony in it, and you shall screen the ark with the veil.
Mark 15:38
The veil of the temple was torn in two from the top to the bottom.