Arcana Coelestia#7063
7063. 'And Aaron spoke all the words which Jehovah had spoken to Moses' means doctrinal teachings received thereby from the Divine. This is clear from the meaning of 'speaking', when used in connection with the teachings represented by 'Aaron', as utterance and declaration, dealt with in 6987, 6999; from the representation of 'Aaron' as truth going forth in an indirect way from the Lord's Divine, thus teachings that present what is true and good, dealt with in 6998, 7009; and from the meaning of 'the words which Jehovah had spoken to Moses' as from the Divine, that is, through truth that goes forth directly from the Lord's Divine, the kind of truth that 'Moses' represents, 7010, 7054.
Arcana Coelestia#6999
6999. 'I know that he will speak' means declaration. This is clear from the meaning of 'speaking', when used in connection with the teachings that 'Aaron' represents, as declaration; for this is a function of teachings, that is, of him who represents teachings and is called 'a mouth', which is utterance, 6987.