Arcana Coelestia # 6730
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.
Lamentations 2:4
4
He has bent his bow like an enemy, he has stood with his right hand as an adversary, Has killed all that were pleasant to the eye: In the tent of the daughter of Zion he has poured out his wrath like fire.
