What commandment does John refer to? Some answer that he refers to the new commandment given in John’s Gospel (13:44), and others that he anticipates what comes later in this chapter (verses 9-10), but John’s letter, though it is profound, is always simple in structure, and his thoughts are tightly woven together with each verse building on the previous verse. The first place to look is in the previous verse, and there we find that believers are taught to live after the example of Christ. It is this that raises the issue of whether the Christian has some totally new commandment to follow, and John answers that this standard of righteousness is what God has always required.