Hadith: There is no one who bears witness that there is no god but Allah and that Muhammad is His slave and Messenger, sincerely from his heart, except that Allah will make him forbidden to Hellfire - Encyclopedia of Translated Prophetic Hadiths

Hadith: There is no one who bears witness that there is no god but Allah and that Muhammad is His slave and Messenger, sincerely from his heart, except that Allah will make him forbidden to Hellfire - Encyclopedia of Translated Prophetic Hadiths