What Jim is suggesting, I think, is that none contain it in the direct form we understand but have been read that way and used to support it as a result of tradition as Christian theology developed. Like the baptismal formula in Matthew 28:19. It is not a statement of the doctrine of the Trinity, but the command to baptize in the name of ... has been read as being supportive of a Trinitarian deity in light of that later development.
In the end, no religion is based solely on what is written in its scriptures. How those writings are interpreted and implemented by its leaders and followers are just as important. If you want to understand religious doctrines, you need to look at the history of the tradition, not just the original scriptures.