Exodus 26:34

And thou shalt put the mercy-seat on the ark of the testimony in the holiest of all.

Exodus 25:21

And thou shalt put the mercy-seat above on the ark, and shalt put in the ark the testimony that I shall give thee.

Exodus 40:20

And he took and put the testimony into the ark, and put the staves in the ark, and put the mercy-seat above on the ark.

Hebrews 9:5

and above over it the cherubim of glory shadowing the mercy-seat; concerning which it is not now the time to speak 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
And thou shalt put the mercy-seat above on the ark, and shalt put in the ark the testimony that I shall give thee.
Exodus 40:20
And he took and put the testimony into the ark, and put the staves in the ark, and put the mercy-seat above on the ark.
Hebrews 9:5
and above over it the cherubim of glory shadowing the mercy-seat; concerning which it is not now the time to speak in detail.

General references

Exodus 40:3
And thou shalt put in it the ark of the testimony, and shalt cover the ark with the veil.
Mark 15:38
And the veil of the temple was rent in two from the top to the bottom.