Yahya related to me from Malik that Umara ibn Sayyad had heardSaid ibn al Musayyab say about abiding good deeds that they were aslave's saying 'Allah is greater' (Allahu akbar) and 'Glory be toAllah' (Subahana'llah) and 'Praise be to Allah' (al-hamdu lillah) and'There is no god but Allah and there is no power and no strengthexcept by Allah.' (La ilaha illa'llah wa la hawla wa laquwwata illa bi'llah.)
USC-MSA web (English) reference: Book 15, Hadith 23
Arabic reference: Book 15, Hadith 495