Sunan Ibn Majah Book 33, Hadith 167
of Allah (saas) said: "Every deed of the son of Adam will be multiplied for him, between ten and seven hundred times for each merit. Allah said: 'Except for fasting, for it is for Me and I shall reward for it.'" (sahih)
the Messenger of Allah (saas) said: "Allah says, 'I am as My slave thinks I am, and I am with him when he mentions Me. If he makes mention of Me to himself, I make mention of him to Myself; and if he makes mention of Me in an assembly, I make mention of him in an assembly better than it. And if he draws to Me a hand-span length, I draw near to him a forearm's length. And if he comes to Me walking, I go to him in a hurry."
"The Prophet (saas) heard me saying: 'La hawla wa la quwwata illa billah (there is no power and no strength except with Allah).' He said: 'O 'Abdullah bin Qais! Shall I not tell you of a word which is one of the treasures of Paradise?' I said: 'Yes, O Messenger of Allah.' He said: 'Say: La hawla wa la quwwata illa billah (There is no power and no strength except with Allah).'"