Praise be to 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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