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.
Blood bridegroom
In Exodus 4:25, this signifies a lack of union between good and truth which together make the church. (Apocalypse Revealed 797)