Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates: The Prophet (peace and blessings be upon him) said: "Whoever helps a wrongdoer in a falsehood in order to thereby push aside a truth has become free of the protection of Allah and the protection of His Messenger."
Al-Tabarani recorded it in all three of his books; the chain in al-Mu'jam al-Kabir contains Hanash, who is matruk (abandoned), while Abu Mihsan claimed that he was a truthful shaykh; the chain in al-Mu'jam al-Saghir and al-Mu'jam al-Awsat contains Sa'id bin Rahmah, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأحكام / 7063
Hadith Gradingمحدثین:ضعیف جداً
Hadith Takhrij«اخرجه الطبراني فى المعجم الصغير (224) اخرجه الطبراني فى المعجم الاوسط (2968) مطولا) اخرجه الطبراني فى المعجم الكبير (11216 مطولا و11539 مختصرا) ، أخرجه المعجم الكبير للطبراني برقم: 11216، وأخرجه المعجم الأوسط للطبراني برقم: 2968، وأخرجه المعجم الصغير للطبراني برقم: 203، وأخرجه إتحاف الخيرة المهرة بزوائد المسانيد العشرة برقم: 4940/3، 7134»
Sayyiduna Aws bin Shurahbil (may Allah be pleased with him), who belonged to Banu Ashja', narrates that he heard the Prophet (peace and blessings be upon him) say: "Whoever walks along with a wrongdoer in order to help him, while knowing that he is a wrongdoer, has left Islam."
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains Ayyash bin Mu'nis, and I have not found anyone who has written his biography; the rest of its narrators have been declared trustworthy, though some of them have been criticised.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأحكام / 7064
Hadith Gradingمحدثین:إسناده ضعیف
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير (619) ، أخرجه المعجم الكبير للطبراني برقم: 619»