Ibn ‘Abbas said :When the deputation of ‘Abd al-Qais came to the Messenger of Allah (May peace be upon him), he commanded them to believe in Allah. He asked : Do you know what faith in Allah is? They replied : Allah and his Apostle know best. He said: It includes the testimony that there is no god but Allah, and that Muhammad is Allah’s Apostle, the observance of the prayer, the payment of zakat, the fasts of Ramadan, and your giving a fifth of the booty

English translation · Sunan Abu Dawud