It is narrated from Hazrat Hammad and Ibrahim. Both of them say that there is no harm in drinking 'Aseer' (fresh juice) as long as it has not boiled. Hazrat Said says: When it starts to boil, then it becomes 'khamr' (intoxicant). And you should avoid it. And Hazrat Ibrahim says: When the 'Aseer' starts to boil, then you should leave it.