Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Amir bin Sa’d. He says that I met Hazrat Abu Ayyub Ansari, so he said to me: Shall I not tell you about the thing which the Messenger of Allah (peace be upon him) told me? That I should frequently say: "La hawla wa la quwwata illa billah" (There is no power and no strength except with Allah), because it is one of the treasures of Paradise.