Iran's Christians are calling on churches worldwide to join them in three days of praying and fasting this weekend.
Elam Ministries, a group that supports Iranian Christians, says the church has come under increased persecution this year, including the introduction of a law requiring the death sentence for men who leave islam to follow christ.
Women would face life in prison.
Click play for an interview with Sam Yeghnazar, president of Elam Ministries.
In an initial vote, Iran's Parliament approved the measure overwhelmingly.
It is now under review before a final vote and approval by the Guardian Council.