This incense-altar typified, 1. The mediation of Christ. The brazen altar in the court was a type of Christ dying on earth; the golden altar in the sanctuary was a type of Christ interceding in heaven, in virtue of his satisfaction. This altar was before the mercy-seat; for Christ always appears in the presence of God for us; he is our advocate with the father (1 John ii. 1), and his intercession is unto God of a sweet-smelling savour. This altar had a crown fixed to it; for Christ intercedes as king. Father, I will, John xvii. 24. 2. The devotions of the saints, whose prayers are said to be set forth before God as incense, Ps. cxli. 2. As the smoke of the incense ascended, so much our desires towards God rise in prayer, being kindled with the fire of holy love and other pious affections.

Matthew Henry