It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Any man who earns wealth from lawful means, then feeds and clothes himself with it and also feeds and clothes others of Allah's creation who are under him, it is zakah (a means of purification) for him. And any Muslim man who has nothing to give in charity, let him say in his supplication: 'Allahumma salli ala Muhammadin abdika wa rasulika, wa salli ala al-mu'minina wal-mu'minati wal-muslimina wal-muslimat' (O Allah, send Your mercy upon Muhammad (peace and blessings be upon him), Your servant and Your Messenger, and send Your mercies upon all the believing men, the believing women, the Muslim men and the Muslim women), for these words will become zakah for him." And he (peace and blessings be upon him) also said: "A believer is never satisfied with hearing good until his final abode is Paradise." This hadith has an authentic (sahih) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.