Sa'id ibn Abi Burda related from his grandfather that the Prophet,may Allah bless him and grant him peace, said, "Every Muslim owes sadaqa."He said, "What do you think he should do if he cannot find anything togive?" He replied, "He should find work and thus benefit himself and beable to give sadaqa." He said, "What do you think he should do if he cannotor does not do that?" He said, "He should help someone with a great need."He said, "What do you think he should do if he cannot or does not do that?"He replied, "He should command the good." He asked, "What do you thinkhe should do if he cannot or does not do that?" He replied, "He shouldrefrain from evil. That is sadaqa for him."
English reference: Book 14, Hadith 306
Arabic reference: Book 1, Hadith 306