The hearing for Yousef Nadarkhani (pictured), Yaser Mosibzadeh, Saheb Fadayee and Mohammed Reza Omidi took place on Wednesday but no verdict was given.
According to Middle East Concern, a third hearing may yet take place.
Three of the men were arrested at a house church meeting in Rasht back in May while their pastor Yousef Nadarkhani faced similar charges later.
Middle East Concern is calling on believers to pray that "a. the four men will be acquitted of the charges of acting against national security b. the appeal in February against the sentence of 80 lashes for consumption of alcohol will be successful, in that the Christian faith of the three men will be recognised by the court and they will be acquitted of these charges that apply to Muslims only c. God will give His peace to the men and their families, and that they will not be anxious d. all officials involved (especially the judge) will love mercy, act justly, learn about Jesus and choose to follow Him."