1 Cor. 14
When the Gifts of the Spirit are operating in the church, Paul says the unbeliever will say, “God is among you.” Specifically, he is referring to prophecy … speaking out what God has revealed … speaking the truths of God’s Word and revealing the mind of His Spirit.
Some translations equate prophecy with preaching. No doubt, preachers can come under the direct influence of the Holy Spirit and “forth-tell” the mind of God. Paul implies that many can exercise this gift in a service. When gatherings are large, this is more difficult. In smaller, more intimate gatherings such as home groups, it is more likely to happen. This is yet another reason why home groups are so important.