Almighty Allah says {And thy garments keep free from stain!} (AI-Mudathir: 4)

On the authority of Ibn 'Abbas (may Allah be pleased with them both) who said that the Prophet (pbuh)

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.”1

The Messenger of Allah (pbuh) said also, "Purify yourselves from the remaining dirty after urination, for most of the torment in the grave is inflected because of inattention about this matter.”2

Assuredly, the acceptance of prayer depends on purifying one's clothing and body from dirty.

In his Al-Hilyah, AI-Hafiz Abu Na'ifm reported on the authority of Shufai Ibn Mati' AI-Asbahi that the Messenger of Allah (pbuh) said, "Four men would increase the harms of the people of the Hell-fire; moving from the Hamim and the Jahim (different places in Hell-fire) and pleading for woe and destruction. The people of Hell would ask one another why those men increase our harm." He (the Messenger) said, "One of the four men is being put in an ark of heated stones, the second one dragging his bowels, the third one vomiting blood and pus while the fourth one is eating his flesh. Then the first one who is being put in on ark of heated stones would be asked about his guilt. Thereupon he would say I used to consume the property of others and my life come to one and without repaying those rights to its people. The same would be done with the second who would explain that he used to neglect washing the remaining dirty off his body after urination. The same would be done with the third one who would declare that he used to enjoy the evil utterance as he enjoys the immoral acts. The same, also, would be done with the fourth who would disclose that he used to backbite and slander others.” 3