“We have already had occasion in discussing the views held of Ea, the water-god,  and of Nusku (with various other designations),  the fire-god, to point out that water and fire constitute the two chief elements in the symbolical rites for exorcising the demons. The Ea-ritual involved washing or sprinkling the body of the victim with water that is to be taken from the Euphrates or Tigris as the sacred streams, or from some bubbling source coming directly out of the earth.
So we read: 
“With pure, clear water,
With bright, shining water,
Seven times and again seven times,
Sprinkle, purify, cleanse !
May the evil Rabisyu depart !
May he step to one side !
May the good Shedu, the good Lamassu, remain in my body!
By heaven, be ye forsworn,
By earth, be ye forsworn.”
An image is frequently made of the demon or of the sorcerer or sorceress, placed on a little boat and sent over the waters to the accompaniment of formulas, voicing the hope that as the image passes along the evil spirit may depart. The little boat is made to capsize and the image is drowned, or it is directly thrown into the water and thus again the hoped for release is dramatically reproduced.
The variations in the rites are naturally endless. It is merely a further modification of the Ea ritual if we find elsewhere directions to surround the bed on which the sick man lies with some kind of porridge made of water and barley, to symbolize the isolation of the individual, and with this isolation to secure his release from the torturing demons.”
Morris Jastrow, The Civilization of Babylonia and Assyria, 1915, np.