Zadan says that a companion narrated this hadith to me, that he heard the Prophet (peace be upon him) say: Whoever is prompted to say "La ilaha illallah" at the time of death will enter Paradise.
Hadith Referenceمسند احمد / مسند المكيين / 15894
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد حسن