If something is forced into the mouth of someone, or his head is forcibly submerged in water, does it invalidate the fast?
Fast Invalidators
Eating and Drinking
To Be Forced to Perform an Invalidator
If something is forced into the mouth of someone, or his head is forcibly submerged in water, does it invalidate the fast? If they are forced to break their fast, e.g. they are told you break your fast or you/your property will be harmed and they eat something in order to evade the danger, is their fast valid?
Forcing food into another’s mouth without their consent does not invalidate their fast and neither does submerging their head in water in the same way. However, if they break the fast themselves when forced or threatened, the fasting becomes void.
Source: Hadana adopted from the Istiftaat of the Grand Ayatollah Khamenei