Sunan Ibn Majah Book 33, Hadith 170
"I passed by the Prophet (saas) and he said to me: 'O Hazim, say often: "La hawla wa la quwwata illa billah (there is no power and no strength except with Allah)," for it is one of the treasures of Paradise.'"
"The Messenger of Allah (saas) said to me: "Shall I not tell you of a treasure which is one of the treasures of Paradise?' I said: 'Yes, O Messenger of Allah.' He said: 'La hawla wa la quwwata illa billah (There is no power and no strength except with Allah).'" (sahih)
Messenger of Allah (saas) said: "Whoever does not call upon Allah, He will be angry with him."