It is narrated from Sayyiduna Sa'd bin Ubadah (may Allah be pleased with him) that he said: I heard the Prophet (peace and blessings be upon him) say: "Whoever says: 'La ilaha illallahu wahdahu la sharika lah' (There is no god worthy of worship except Allah, alone, He has no partner), while his heart submits to this word and his tongue humbles itself before it, and (also says:) 'Wa ash-hadu anna Muhammadan rasulullah' (And I bear witness that Muhammad (peace and blessings be upon him) is the Messenger of Allah), Allah, the Mighty and Majestic, will make that person forbidden to the Fire."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Zayd (may Allah have mercy on him) except his son, and Ibn Wahb (may Allah have mercy on him) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الألف / 1364
Hadith Gradingمحدثین:إسناده ضعيف لضعف عبد الرحمن بن زيد بن أسلم
Hadith Takhrij«قال الهيثمي: فيه عبد الرحمن بن زيد بن أسلم والأكثر على تضعيفه «مجمع الزوائد ومنبع الفوائد، ج 1، ص 21»»