Jeremy Corbyn said he would tell Jewish community leaders he has an "absolute determination" to ensure there is no anti-Semitism in Britain's Labour party.
The party's leader will have talks with the Board of Deputies of British Jews and the Jewish Leadership Council (JLC) on Tuesday afternoon after weeks of criticism of Labour's handling of anti-Semitism allegations.
Mr Corbyn's comments came after a senior shadow cabinet minister said Labour members must acknowledge the party has an issue with anti-Semitism.
The 5pm showdown between Mr Corbyn and the Jewish community leaders comes after protests and criticism from Labour MPs and international condemnation over the way he has dealt with hostility to Jews.
Asked what his message would be, Mr Corbyn told ITV News: "We are going to have a good discussion, a good discussion about their concerns and about my absolute determination to ensure there is no anti-Semitism anywhere, in any party in Britain, including my own."
Writing in the Evening Standard, Mr Corbyn apologised for the pain caused by the problem.
"We have not done enough fully to get to grips with the problem, and for that the Jewish community and our own Jewish members deserve an apology," he said.
He acknowledged party process had "been simply not fully fit for purpose" and "we did not look closely enough at ourselves".
Organisations representing Jewish communities will call on Mr Corbyn to use his "personal authority" to drive through changes to wipe out the problem in the party.
The Board of Deputies of British Jews and the (JLC) said there must be "action not words" when they accepted his invitation to meet.
Labour Jewish MPs spoke out about anti-Semitism in the party during a debate in Parliament and warned "enough is enough".
Holocaust survivor Susan Pollack called for Mr Corbyn to show leadership in tackling anti-Semitism.
"He has to act and he has to show his leadership, and then I think that's the only way we will have respect," she told BBC Radio 4's Today.
Asked if Mr Corbyn had shown leadership on the issue, shadow communities secretary Andrew Gwynne sidestepped the question, saying: "I think what we have now got to do - and we have got an issue in the Labour Party - we have got to acknowledge that that problem exists and, for some, that is a challenge.
He told Today that Labour had to "rebuild confidence in the Jewish community" adding: "I think it's my job as shadow communities secretary to try and rebuild some of that trust, and it's Jeremy's job as the leader of the Labour Party to try and rebuild some of that trust."
Mr Gwynne acknowledged the party's disciplinary process had taken "far, far too long" in deciding cases such as former London mayor Ken Livingstone.
Jenny Manson, co-chair of the Corbyn-supporting Jewish Voice for Labour, said "none of us in my group have ever experienced any anti-Semitism in the Labour Party" and warned against a "witch hunt".
The Board of Deputies, made up of almost 300 deputies directly elected by synagogues and community organisations, and the JLC, a charity supporting the Jewish community, took the unusual step of protesting outside Parliament in March before delivering an open letter to a meeting of Labour MPs and peers about their concerns.
The Labour leader has said he is "happy to meet" the two bodies "without any preconditions" and pledged to hear their concerns about tackling anti-Semitism in the Labour Party.
In a letter accepting his invitation, the organisations thanked Mr Corbyn for his commitment to addressing the "anguish" caused by anti-Semitic incidents.
However, they said recent events had not been "reassuring" for Jewish people in Britain and told him he must root anti-Semitism out of his party.
They later refused to attend a roundtable meeting Labour had proposed to hold on Wednesday with a wider group of Jewish organisations that reportedly included Jewish Voice for Labour, a recently-established group that has downplayed the issue.
The Labour leader has admitted the party needs to "do better" in the fight against abuse and has issued an apology for the "pain and hurt" caused by anti-Semitism.