Purity: Minor Occurrences After Precautionary Measures
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 707:
If someone performs jabīrah ghusl and tayammum as a precautionary measure, and after performing jabīrah ghusl and tayammum he performs a prayer, and after performing the prayer he has a minor occurrence[1] – for example, he urinates – then in such a case, for subsequent prayers he must perform wuḍūʾ. In the event that the occurrence happens before prayers, he must perform wuḍūʾ for that prayer as well.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)
1
See the footnote pertaining to Ruling 384 for an explanation of this term.