It is obligatory upon those who

A: All Praise is due to Allah Alone and peace and blessings be upon His Messenger, his family, and Companions. To commence: Istinja' or Istijmar (cleansing the private parts with hard material after urination or defecation) is a must after passing urine or stool. Without it, the Wudu' and Salah are invalid. (Part No. 5; Page No. 104) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.