Sydney Carter:

This song is unique in one respect; I have hardly changed a note or a word of it since the first time it was written. Printers have,however. Instead of

"My body will
Hang on the cross of the world
Tomorrow" He said "And today."

they have printed "not" instead of "and".

I agree with Ian in being sure that Sydney would not have liked those last two verses in the first version Mick Pearce linked to. The song he wrote implied Jesus returning in a sense, but not that sense.