Aaron
Aaron was the brother of Moses. He symbolizes two things, at different stages of the story.
During the first part of the exodus, when he was Moses' spokesperson, Moses represents the Word as it truly is, as it is understood in heaven, while Aaron represents the Word in its external sense, as it is understood by people in the world. This is why Aaron talks for Moses, and the Lord says of him "he shall be as a mouth for you, and you shall be to him as God." (Exodus 4:16)
Later, after the Tabernacle was built and he was inaugurated as high priest (see Leviticus 8,9), Aaron represents the Lord as to the Divine Good, and Moses represents the Lord as to the Divine Truth.
In Exodus 28:1, Aaron signifies the conjunction of Divine Good with Divine Truth in the Divine Human of the Lord. (Arcana Coelestia 9806, 9936)
In Exodus 32:1, Aaron represents the external of the Word, of the church, and of worship, separate from the internal. (Arcana Coelestia 10397)
In Exodus 4:14, before he was initiated into the priesthood, Aaron represents the doctrine of good and truth. (Arcana Coelestia 6998)
Arcana Coelestia #6998
6998. 'And He said, Is there not Aaron your brother, the Levite?' means teachings that present what is good and true. This is clear from the representation of 'Aaron' as the Lord's Divine Goodness or His Priesthood; but here, before his introduction into the priesthood, he represents teachings that present what is good and true. This is also the reason why it says that he will be for Moses 'as a mouth', and Moses will be for him 'as a god'; for 'Moses' represents the Lord's Divine Truth as it goes forth directly from the Lord, and therefore 'Aaron' represents Divine Truth that goes forth from the Lord in an indirect way. And this truth consists in teachings that present what is good and true. The kind of truth that 'Moses' represents here is truth that a person is unable to hear or discern, 6982; but the kind of truth that 'Aaron' represents is truth he can hear and discern. This is why Aaron is called 'a mouth' and Moses is called 'his god'. It also explains why Aaron is referred to as 'the Levite', for Levite' means the Church's teachings presenting what is good and true, teachings which are of use and service to the priesthood.