Sdqh bin Khalid al-Amwy صدقة بن خالد الأموي · The Book of Drinks

"Umar bin 'Abdul-Aziz wrote to us, saying: 'Do not drink the thickened juice of grapes (obtained by boiling it down) until two-third of it has gone and one-third is left. And every intoxicant is unlawful.'"