How Rabbi Shallum Fooled the Founder of Islam In Order To Eliminate A Notorious Anti-Semite
An Excerpt from the blog post: From the Islamic Invasion to the Crusades – A History of the land of Israel by Rabbi Joseph Schwarz (first published in 5610/1850) with Commentary
Mahomed had an astrologer at his court called Bucheran, who was a very great enemy of the Jews, and urged the prophet constantly to persecute and exterminate them entirely, so that Mahomed at length listened to the proposition, since he had without this already a hatred towards them, because they had not aided him in his campaigns according to his expectation; wherefore the whole Jewish population under his rule, ran great danger of being entirely cut off. Rabbi Shallum, son of the then Resh Gelutha, in Babel, perceiving this dreadful predicament, went to Mahomed, and offering him his submission, friendship, and services, endeavoured to enter with him into a friendly compact. Mahomed accepted his proposition with pleasure, conceived a great affection for him, and took his daughter, a handsome young girl, for wife; he made him also a general in his army, and gave him the name of Abu Bachr al Chaliva al Zadik, literally: The father of the maiden, the descendant of the righteous; this means, that of all his wives, who were either widows or divorced women, this one was the only one who had never been married before, and then she was the granddaughter of the celebrated chief of the captivity; therefore, the descendant of the righteous. This occurrence induced Mahomed to give up his terrible intention to destroy the Jews in his country, and thus did Rabbi Shallum save his people.
Abu Bachr and Aliman now resolved among themselves to remove the dangerous enemy of the Jews, Bucheran. One evening Mahomed, Bucheran, Aliman, and Abu Bachr, were drinking together; the latter two soon saw that Mahomed and the astrologer were strongly intoxicated, and lay stretched out in a deep and profound sleep. Abu Bachr thereupon drew the sword of Mahomed from its scabbard, cut off therewith Bucharan’s head, and put the bloody sword back into its receptacle, and both then lay themselves down quietly near Mahomed to sleep. When Mahomed awoke and saw his friend lying decapitated near him, he cried out in a fury: “This terrible deed has been done by one of us three in our drunkenness!” Abu Bachr thereupon said quite unconcernedly: “Let each one draw his sword, and he whose weapon is stained with blood, must needs be the murderer!” They all drew their swords, and that of Mahomed was completely dyed with fresh blood, which proved thus clearly to his satisfaction that he had murdered his friend. He was greatly grieved at this discovery; cursed and condemned the wine which was the cause of this murder, and swore that he never would drink any more, and that also no one should do so who wishes to enter heaven. This is the cause why wine is prohibited to the Mahomedans.
This ends the quote from the historical account written by Rabbi Joseph Schwarz.
Rabbi Schwarz Implied in His Article That Rabbi Shallum Fooled the M-Prophet Under the Identity of Abu Bachr In Order to Save A Large Number of Jews
It must also be stressed that although Rabbi Shallum and his daughter might have had good intentions, a Jew is not allowed to change his religion, even when the goal is to save lives. See Radbaz Vol. 4, siman 92 and Beit Yosef to Yoreh Deah, siman 157 why the excuse that they were saving lives is not accepted by Halacha and for more precise definitions on what is considered changing religion.