Purity: Ruling on Juice from Mixed Ripe and Unripe Grapes

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 199

If, for example, there are some ripe grapes in a bunch of unripe grapes and the juice extracted from the bunch is not regarded as grape juice and it bubbles, then drinking it is lawful.

-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)