Romans 8:23 states "And not only the creation, but we ourselves, who have the firstfruits of the Spirit…" As in other passages, Paul is using "first fruits" as a metaphor for the first appearance of a promised blessing. Here, it is the Holy Spirit, the "helper" who Jesus promised in John 14:26. The very first followers of Jesus were also the very first to experience the blessing of the indwelling of the Holy Spirit—they received the "first fruits" of the Holy Spirit's work in the lives of believers.