Charles H. Spurgeon on Psalms 141:2

Let my prayer be set forth before thee as incense. Literally, Let my prayer, incense, be set in order before Thee, —implying that prayer was in the reality what incense was in the symbol ...Passing to New Testament Scripture, though still only to that portion which refers to Old Testament times, we are told of the people without being engaged in player, while Zacharias was offering incense within the Sanctuary (Lu 1:10); they were in spirit going along with the priestly service. And in the book of Revelation the prayers of saints are once and again identified with the offering of incense on the golden altar before the throne. Re 5:8 8:3-4. —Patrick Fairbairn, in "The Typology of Scripture."