If Peshab and mani are both najis, if we go for toilet for peshab and only need to take taharath but if mani come, why do we do ghusl janabat? Can you please explain the same aand give any book reference I will check.

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Peshab ki jagah se 5 chize mard k niklti hy
1- peshab
2- mani
Yeh dono najis hy.
Baki 3 chize jo paak hy.
Voh kabhi bimari me to kabhi bivi se chhed chhad se ya kabhi peshab k baad niklti hy.