The Ministry of the Two Witnesses

In the last half of the Tribulation God will have two prophets witness for Him. They will be empowered by the Holy Spirit, like Joshua and Zerubabbel. What will their ministry be? They will be able to call down fire on their enemies, like Elijah. They will be able to stop the rain for three and one-half years, like Elijah. They will be able to turn water to blood, like Moses. They will be able to smite the earth with all kinds of plagues, similar to Moses.