Maymuna, the wife of the Prophet, said, "I heard Anas ibn Maliksay that the Messenger of Allah, may Allah bless him and grant him peace,said, 'Whoever says in the morning, "O Allah, we bear witness to you andwe bear witness to the bearers of You Throne and Your angels and all Yourcreation. You are Allah. There is no god but You alone with no partnerand Muhammad is your slave and Messenger", by that Allah will free a quarterof him from the Fire on that day. If someone says it twice, Allah willfree half of him from the Fire. If he says it four times, Allah will freehim completely from the Fire on that day.'"
English reference: Book 49, Hadith 1201
Arabic reference: Book 1, Hadith 1201