And he took bread, and when he had given thanks, he brake it, and gave to them, saying, This is my body which is given for you: this do in remembrance of me. (ASV)
Part of this verse, and all of the following verse may have been added later by a Christian who wanted to change the theological message of the Gospel ascribed to Luke. There are several reasons to think this, one being that some of our older manuscripts read
"This is my body. But behold, the hand of the...." instead of
"This is my body which is given for you: this do in remembrance of me. And the cup in like manner after supper, saying, This cup is the new covenant in my blood, [even] that which is poured out for you. But behold, the hand of ...."
In addition to this, the inserted text shows a belief that it's Jesus' death that atones for sins, which Luke apparently didn't believe. When one of his sources (Mark) says this in Mk 10:45 and Mk 15:39, Luke deletes those words, and never, in either Luke nor Acts, does Luke ever say that it's Jesus' death that brings salvation, but rather that it is the believer's repentence when faced with that death that brings salvation.
For more on this, see Ehrman's "Misquoting Jesus", pg. 166.
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