Knowing Jeff he will call about midnight.
I'd like to talk to him
He may refer to the Sermon on the Mount, composed as it is of contrasts between the Old way and the New ("Ye have heard it said... but I say unto you..."). Really the central basis of Christian Doctrine imho. For example, the Old Testament notion of "an eye for an eye" contrasted with Jesus Christ's message of "turn the other cheek".
The reason he may refer to it is that Jesus also claimed (if we are to believe that our transcriptions are accurate) that he said "I am not come to destroy, but to fulfill" the old laws. Did he really say this? Of course that is unknowable, so the question becomes "was he really likely to have said this?"
If he did, was it a political maneuver, either to make his message seem more palatable to his religious audience (and the authorities) or to save his own skin (in which case it was, perhaps, a bit lacking)?
His further attacks in the Sermon, including those upon ostentation (even ostentatious shows of piety), materialism, and judgmentalism, were clearly aimed at the religious leadership of his age. But it was his reinterpretation of the Ten Commandments that remains the crux of the matter, and it seems to me that he clearly renounced the existing wisdom. Finally, the injunction to love your enemies was, and remains, radical.