Arcana Coelestia#6975
6975. 'You are to take some of the water of the river' means factual knowledge that has falsities in it. This is clear from the meaning of 'the water of the river' - the river of Egypt, or the Nile - as factual knowledge that has falsity in it. 'Water' means truths, see 2702, 3424, 4976, and in the contrary sense falsities, 790, while 'the river of Egypt' means the falsity within factual knowledge, 6693.
Arcana Coelestia#6694
6694. 'And every daughter you shall keep alive' means that they should not attack good. This is clear from what has been stated above in 6677, where similar instructions occur.