David Cameron told 1,200 guests at Jewish Care's annual dinner that the charity is "the best of Jewish and the best of British".
But Steven Lewis, Jewish Care chairman, said that the government's decision to raise the minimum wage meant the charity needed an extra £4 million every year.
During a week in which swastikas were discovered at a children's playground in Stamford Hill, the prime minister promised that he would protect the community from antisemitic attacks. Speaking on Monday at the Grosvenor House Hotel in central London at an event which raised £5.1m for the charity, Mr Cameron told guests: "I care passionately about your security.
"Sadly we've seen growing examples of antisemitism here at home. I promise that wherever we see antisemitism, from politicians who should know better to abusive graffiti daubed on synagogues and homes, I will do everything I can to drive it out of the country."
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