It is reported from Sayyidah Aishah (may Allah be pleased with her) that she heard the Messenger of Allah (peace and blessings be upon him) say: "The thief's hand is not to be cut off except for a value of a quarter of a dinar or more."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السرقة / 17162