An ISIS banner on the Temple Mount. Photo: Rahel Jaskow.

A Twitter post Thursday by supporters of the Islamic State of Iraq and Syria (ISIS), now calling itself the Islamic State (IS), has promised a Holocaust against the Jews.

“The Real Zionist Holocaust is Predicted in the Hadiths! The Hour [resurrection] will not take place until the Muslims fight the Jews and the Muslims kill them, and the tree will say: “Oh, Muslim, servant of God, there is a Jew behind me, kill him! THE PROMISED Holocaust,” a graphic posted on the @ISIS_Conquests’s Twitter account said.

This hadith has proven popular with Islamic extremists of all stripes, ranging from IS to Hamas – and even on television in the Middle East.

Daniel Pipes, an expert on jihadism, said the hadith likely was a recruitment tool.

“”‹Yes, “‹calling for a Holocaust against Jews refers to a violently anti-Semitic strain among jihadis and will surely appeal to some of them,” Pipes said in an email to the Investigative Project on Terrorism.

Anti-Semitic propaganda has played an important role in the terrorist group’s recruitment efforts. Its leader, Abu Bakr al-Baghdadi, placed Jews on the side of evil in a speech posted last Tuesday on the Internet in which he called on Muslims to join him.

“O ummah of Islam, the world today has been divided into two camps and two trenches … The camp of Islam and faith, and the camp of kufr (disbelief) and hypocrisy … all being led by America and Russia, and being mobilized by the Jews,” al-Baghdadi said.

In another such video released on Twitter, IS told jihadists to “Break the crosses and destroy the lin­eage of the grand­sons of mon­keys.”

Some jihadist supporters are calling on the group to open a new front against Israel.

“@ISIS_Conquests Hey #ISIS please do us all a favour & open up a front against Israel. Surely they are the greatest enemy of humanity?” Akhmet Qassam, a supporter from Scotland, asked the group on Sunday. Another Tweet read, “@ISIS_Conquests If you open up a front against #Israel I’m sure your numbers will increase hugely. Also give you some legitimacy.”

At the same time, IS may be growing cautious about drawing unwanted attention from Western intelligence and law-enforcement agencies even as it seeks new recruits.

“All Brothers and Sisters…Don’t meet with IS members while you’re living in the West…Move out of the West & than (sic) you get in touch with IS,” @Dawla_Newsmedia wrote a day after U.S. law enforcement caught Shannon Maureen Conley, a 19-year-old woman from Denver, trying to leave the U.S. to join the IS.