Officials in Tehran charged four men with “acting against national security” and drinking alcohol after they took part in communion.
Pastor Yousef Nadarkhani, Mohammadreza Omidi, Yasser Mossayebzadeh and Saheb Fadaie have been sentenced to ten years in prison each.
In a further blow Nadarkhani and Omidi were given additional sentences of two years in exile in southern Iran.
Drinking alcohol in Iran is forbidden under the country's strict Sharia Islamic law, but despite the ban, enjoying a sly tipple at home is believed to be widespread amongst its 80 million strong population.
Holy Communion wine, also known as sacramental wine, is used by billions of Christians worldwide in celebration of the Eucharist.
It is often watered down and is used during Holy Communion alongside small bread wafers, known as Sacramental Bread.
The authorities accused the men of “propagating house churches” and “promoting Zionist Christianity”.
Charity Christian Solidarity Worldwide (CSW) condemned the sentences and said the Christian community in Iran has been criminalised.