But he added: “I have no contact whatsoever now with Paul Eisen and Deir Yassin Remembered. I did attend a number of events concerning DYR some years ago, I think two or three of them. The only donation would have been in a collection bucket going round the room, that’s all.
“Fifteen years ago he certainly was not a Holocaust denier, had he been a Holocaust denier or stated he was, I would have had nothing to do with him. Obviously Holocaust denial is vile and wrong.”
However a post on the DYR website shows Mr Corbyn attending the April 2013 event. It is not clear whether Mr Eisen was also at the commemoration.
Mr Eisen had written a blog four months earlier titled “How I became a Holocaust denier”.
In it he wrote: “I question that there ever existed homicidal gas-chambers. I question the figure of six million Jewish victims of the Nazi assault and I believe that the actual figure was significantly less.”
Mr Corbyn's fellow Labour MP Gerald Kaufman also attended the April 2013 commemoration.
Click here to see the picture and website post.