Musannaf Ibn Abi Shaybah

Hazrat Abu Darda narrates: One day I said, "O Messenger of Allah (peace and blessings be upon him)! The wealthy people have surpassed us in reward and virtue. They pray as we pray, they fast as we fast, they perform Hajj as we perform Hajj, and they also give charity, but we do not possess enough wealth to give charity." Hazrat Abu Darda says, then the Prophet (peace and blessings be upon him) said: "Shall I not tell you something, which if you do, you will reach the reward of those who have surpassed you, and after you, only those who do the same will reach your reward: After every prayer, say Subhan Allah thirty-three times, Alhamdulillah thirty-three times, and Allahu Akbar thirty-four times."