This is another article in the chapter Enormities from the classical manual on Sharia called Reliance of the Traveller. The articles are posted one by one in the order they are given in the book.
p31.0 NOT FREEING ONESELF OF ALL TRACES OF URINE
p31.1 Allah Most High says,
“And your raiment purify” (Koran 74:4).
p31.2 The Prophet (Allah bless him and give him peace):
(1) passed by two graves and said, “The two are being tormented, and not for anything excessive:
one of them did not free himself of traces of urine. while the other was a talebearer [def: r3].”
(2) And he said, “Take care to remove all vestiges of urine from your persons, because it is the main reason for torment in one’s grave.”
Moreover, the prayer of someone who does not protect his person and clothing from urine is not acceptable (A: which is how scholars interpret the above hadiths, as applying to those who are negligent in removing all traces of urine before they pray).