Apocalypse Explained#241
241. (Revelation 3:18) I counsel thee. That this signifies the means of reformation of those who hold the doctrine of faith alone, is evident from the things that now follow; for the reformation of those who are in that doctrine is now treated of; hence, I counsel thee, involves precepts how they ought to live in order that they may be reformed, and so be saved.
Arcana Coelestia#7269
7269. 'And Aaron your brother will be your prophet' means doctrinal teachings derived from it. This is clear from the meaning of 'prophet' as the truth contained in doctrinal teachings, thus teachings derived from the Word, dealt with in 2534. For more about the representation of 'Aaron' as the teachings of the Church or teachings derived from the Word which present what is good and true, see 6998, 7009, 7089. Since 'prophet' means doctrinal teachings, its meaning in a more precise and limited sense is, in accordance with what has been stated immediately above at the end of 7268, a teacher.