Sayyiduna Ibn Umar (may Allah be pleased with them both) said: I heard Sayyiduna Umar (may Allah be pleased with him) on the pulpit of the Messenger of Allah (peace and blessings be upon him) saying: Amma ba'd (to proceed)! O people, the prohibition of wine has been revealed, and it is made from five things: grapes, dates, honey, wheat and barley; and wine (khamr) is whatever clouds the mind. And there are three matters about which I wished that he (peace and blessings be upon him) had told us the ruling before parting from us: kalalah, the grandfather, and the rulings of usury (riba).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12411