6730. 'To wash at the river' means worship involving the use of falsity. This is clear from the meaning of 'washing' as purification from what is understood spiritually by filth, dealt with in 3147, worship consequently being meant since worship takes place for the sake of purification; and from the meaning of 'the river', in this case the river of Egypt, as falsity, dealt with in 6693.

'The plagues of Egypt' signify the falsities and lust which cause the church to perish.

In Revelation 16, 'the plagues were poured out upon men by angels from heaven' when they were truths and goods sent down by the Lord which were turned into evils and falsities by the people who were below. 'Plagues' signify evils of love, and falsities of faith.

(Riferimenti: Apocalypse Revealed 656)