Sayyidah Aishah (may Allah be pleased with her) said that the Prophet (peace and blessings be upon him) said: "Every intoxicant is unlawful, and whatever of it intoxicates in the quantity of a faraq (a large measure), a palmful of it is unlawful."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الأشربة والحد فيها / 17397