read Malachi again, there is an “AND” between incense and the pure offering, indicating seperate concepts.
for the Christian, the “pure offering” is Jesus Christ.
All right, lets go with your view for the sake of illustration. Christ died once for all.
Hebrews 10:10 By the which will we are sanctified through the offering of the body of Jesus Christ once for all. 11 And every priest standeth daily ministering and offering oftentimes the same sacrifices, which can never take away sins: 12 But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God;
No continual sacrifice. Not continually offering that “pure offering”. On the Cross Jesus said “it is finished”. There can be no “pure offering” on a continual basis.