Yahya related to me from Malik from Yahya ibn Said from Amra bintAbd ar-Rahman that A'isha, the wife of the Prophet, may Allah blesshim and grant him peace, said, "It has not been a long time for me andI have not forgotten. A thief's hand is cut off for a quarter of adinar and upwards."
USC-MSA web (English) reference: Book 41, Hadith 24
Arabic reference: Book 41, Hadith 1527