That description aligns with the prevailing view of Holocaust historians, but was contradicted by Mr. Netanyahu in a speech on Oct. 20 to the World Zionist Congress where he recounted the meeting between Hitler and Mr. Husseini. “Hitler didn’t want to exterminate the Jews at the time — he wanted to expel the Jews,” Mr. Netanyahu said in his speech. He quoted the mufti as saying, “If you expel them, they’ll all come here,” referring to Palestine, and then said Hitler had asked, “So what should I do with them?” The mufti replied, “Burn them,” according to Mr. Netanyahu.

Historians declared his account to be a lie that appeases Holocaust denial, and many political analysts said Mr. Netanyahu’s speech undermined his own accusations that President Mahmoud Abbas of The Palestinian Authority was peddling falsehoods. But the controversy had mostly died down, making the timing of Mr. Netanyahu’s Facebook post — on a Friday afternoon, a quiet time in the Israeli news media — curious.

Asked why the prime minister had issued the additional statement, a senior Israeli official would only say, “Set the record straight,” and only on the condition of anonymity.

Mr. Netanyahu wrote in the Facebook post that his initial “remarks were intended to illustrate the murderous approach of the mufti to the Jews in his lengthy contacts with the Nazi leadership.” He said Mr. Husseini “propagated the big lie that the Jews intend to destroy the al-Aqsa mosque,” an idea that has been cited as a main motivator for this month’s spate of Palestinian attacks against Israeli Jews.