Kathir bin Ziyad كثير بن زياد · The Book on Salat (Prayer)

"Some of the poor people came to Allah's Messenger (S) and said: 'O Messenger of Allah (S)! The rich pray as we pray, they fast as we fast, but they have wealth with which they free slaves and which they give in charity.' He said: 'When you perform Salat, then say: 'Subhan Allah' thirty-three times, and: 'Al-Hamdulillah' thirty-three times, and: 'Allahu Akbar' thirty-four times, and 'La ilaha illallah' ten times. With that you will have surprassed them, and none would…