Protestant, ReformedThe Mass as a memorial, not a sacrifice
Ulrich Zwingli The Sixty-seven Articles, article 18
“Christ, who offered himself once on the cross, is the sacrifice and victim that makes satisfaction for ever for the sins of all the faithful. From this it follows that the Mass is not a sacrifice, but a commemoration of the sacrifice offered once on the cross and, as it were, a seal of the redemption through Christ …”
Our translation. The words as written, in Latin:
“Christus qui sese semel in cruce obtulit hostia est et victima satisfaciens in æternum pro peccatis omnium fidelium. Ex quo colligitur, missam non esse sacrificium, sed sacrificii in cruce semel oblati commemorationem et quasi sigillum redemptionis per Christum …”
Read it in the source: CCEL
The Catholic answer: The Mass as sacrifice