In sum, whoever deliberately fabricates something and attributes it to the Messenger of Allah ﷺ has already taken his seat in the Fire; and whoever knowingly transmits a forged ḥadīth, aware that it is false, becomes one of the two liars—the forger and the conveyor—and must likewise reserve his place in Hell.
How many pamphlets are circulated these days that promise reward or threaten punishment while being falsely ascribed to the Messenger ﷺ! Some zealous yet ignorant people reproduce such sheets in large quantities, saying, “We are admonishing the public with them.” But how can you admonish people with a lie? For that reason, these handouts—whether spread inside mosques, posted on their doors, or distributed elsewhere—must be treated with extreme caution. They may contain fabrications, and anyone who disseminates them while knowing they are false has already secured his seat in the Fire.
The Prophet ﷺ said in the ḥadīth narrated by ʿAbdullāh ibn ʿAmr: “Relate from the Children of Israel, and there is no sin in doing so.” The Children of Israel—the Jews and Christians—may be quoted without blame, provided you are not aware of any clash with the Islamic sharia. They are known for altering words from their proper places and inventing lies. Therefore, if they inform you of something good, you may recount it as long as it does not contradict what the Messenger of Allah ﷺ has brought. If it does contradict the sharia, it is impermissible to transmit it—unless you cite it expressly to expose its falsehood. In that case, there is no blame. And Allah knows best.