Arcana Coelestia#10537
10537. 'And Jehovah said to Moses' means instruction. This is clear from the meaning of 'saying', when Jehovah is the speaker, as instruction, dealt with in the places referred to in 10280, at this point instruction showing that Divine Truth did not reside with the actual nation, which is meant by the command to them to take off their finery, dealt with below.
Arcana Coelestia#7226
7226. 'And Jehovah spoke to Moses and to Aaron' means instruction once again from the law of God and at the same time from doctrinal teachings. This is clear from the meaning of 'speaking to' as instruction once again, for in what follows next they are given instructions about what they are to do; from the representation of 'Moses' as the law of God, dealt with in 6723, 6752; and from the representation of 'Aaron' as teachings presenting what is good and true, dealt with in 6998. For the difference between the law of God and doctrinal teachings, see 7009, 7010, 7089.