7291. 'You shall say to Aaron' means influx and communication - of the law of God, represented by Moses, with the doctrinal teachings, represented by 'Aaron'. This is clear from the meaning of 'saying', when done by Moses to Aaron, as influx and communication, as in 6291. Here 'saying' is similar in meaning to 'speaking', namely both influx and communication, which is meant by 'speaking', see 7270. The only way that this influx and communication can be expressed in the historical narratives of the Word is by the words 'saying and 'speaking'. The reason why the law of God, represented by 'Moses', was to flow into the doctrinal teachings, represented by 'Aaron', is that the law of God is internal truth, while doctrinal teachings are external truth; and it is a general rule that internal things flow into external, not the other way round, for the reason that internal things are more refined than external, whereas external things are grosser, being generalized expressions of the internal ones.