I don't think that Jay Adams believes that the church started until Pentecost, like most Protestants as himself, so how did Jesus sing in the church, as seen in Hebrews 2:12? Jay Adams uses an example of Jesus singing. OK. He sang in the church. If Jesus sang in the church, then the church was existent when He gathered with His disciples during His lifetime. If we are looking to get our doctrine only from Scripture, sole Scriptura, then the church must have begun during Jesus' lifetime before Pentecost. Let's not make this more difficult than it is.