"'...The Christian drinks wine with his food, instead of water, without getting drunk and this increases his strength.' 'The Muslim, on the other hand, drinks wine only in order to get as drunk as possible. He loses his reason, goes mad...'"
This was mentioned in the book, "Ibn Fadlan and the Land of the Darkness: Arab Travellers in the Far North" written by "Ibn Fadlan" and translated by "Paul Lunde" and "Caroline Stone".