IslamQA
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Summary (from the source)
Istinja’ is not necessary each time a person wants to do Wudu. It is essential after passing urine or stools, when a person must wash his private parts before doing Wudu for prayer.
Question
Does a person have to do Istinja’ (wash the private parts with water) every time he wants to do wudu?
Answer
Praise be to Allah, and blessings and peace be upon the Messenger of Allah:
Istinja’ is not necessary each time a person wants to do Wudu. It is essential after passing urine or stools, when a person must wash his private parts before doing Wudu for prayer.
For more details, please refer to the following answers: 272976 , 59928 , 219157 , 223396 , 175125 , and 2137 .
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