Musnad Ahmad 1153:2097

'Abd al-Samad narrated to us, Hammam narrated to us, Yahya narrated to us, from Muhammad ibn 'Abd al-Rahman ibn Zurarah, from 'Amrah bint 'Abd al-Rahman, from 'Aishah, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "The hand is not to be cut except for a quarter of a dinar."