Musnad Ahmad 1153:419

Yahya ibn Ishaq narrated to us, Mahdi ibn Maymun informed me, Abu Uthman al-Ansari narrated to me, from al-Qasim ibn Muhammad, from Aisha, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whatever amount of it causes intoxication by the *faraq* (a large measure), then a handful of it is forbidden."