Eucharist
Luke 22:19-20
This is my body, which is given for you: do this for a commemoration of me... This is the chalice, the new testament in my blood, which shall be shed for you.
Context of the passage
Luke's account of the Last Supper uniquely records Christ's command 'do this in remembrance of me,' establishing the Eucharist as a perpetual memorial-sacrifice.
Catholic reading
The command 'do this' (poieite, a priestly/sacrificial term used in the Greek Old Testament for offering sacrifice) commissions the apostles to perpetuate this sacrificial memorial, the foundation of the ministerial priesthood and the Mass.
Common objection
'In remembrance' suggests a mere commemorative meal, not a re-presented sacrifice.
Response
In Jewish thought, a 'memorial' (zikkaron) makes a past saving event truly present, as with Passover itself; the Eucharist likewise makes Calvary's one sacrifice present, not merely recalled psychologically.