The mercy-seat hath been always considered as among the dearest types of Christ, Romans 3:25; 1 John 2:2. Hence Paul's advice, Hebrews 4:16.
Related Commentaries of Exodus 25:17
Exodus 25:17
17 And thou shalt make a mercy seat of pure gold: two cubits and a half shall be the length thereof, and a cubit and a half the breadth thereof.