Exodus 25:21 commands putting the mercy seat on the ark, the same action repeated in Exodus 26:34 for the Most Holy Place.

Exodus 40:20 records Moses executing the command to place the mercy seat on the ark, fulfilling Exodus 26:34.

Exodus 25:17 instructs making the mercy seat, which is then placed on the ark in Exodus 26:34.

Hebrews 9:5 mentions the cherubim overshadowing the mercy seat, directly referencing the object placed on the ark in Exodus 26:34.

Leviticus 16:2 reveals the mercy seat as the place where God appears in the cloud, and restricts entry—deepening its significance.

1 Kings 8:6 shows the ark with the mercy seat being placed in the Most Holy Place of Solomon's temple—a later parallel.