Laws about different kinds of water - Section 3 Mishkat al-Masabih 489
Translation
‘Umar b. al-Khattab said, “Do not wash in water which has been exposed to the sun, for it produces leprosy.” Daraqutni transmitted it.
‘Umar b. al-Khattab said, “Do not wash in water which has been exposed to the sun, for it produces leprosy.” Daraqutni transmitted it.