Narrated Abu Huraira (Radi Allah Anhu):
Some poor people came to the Prophet Muhammad (sal-allahu-alleihi-wasallam) and said, “The wealthy people will get higher grades and will have permanent enjoyment, and they offer !Salat (prayer) like us and observe Saum (fast) as we do. They have more money by which they perform the Hajj, and ‘Umra; fight and struggle in Allah’s Cause and give in charity.” The Prophet Muhammad (sal-allahu-alleihi-wasallam) said, “Shall I not tell  you a thing upon which if you acted you would catch up with those who have surpassed you? Nobody would overtake you and you would be better than the people amongst whom you live except those who would do the same. Say Subhan Allah, Alhamdulillah and Allahu Akbar thirty three times each after every (compulsory) !Farz Salat (prayer).”

[Sahih Bukhari : Hadith No. 479]