Ji bilkul Jannat ki halat nahin Insan Najis hota hai. Magar yeh najasat ek batini Najasat hai( ismain jism najis nahin hota agar Insan apni sharmgah se semen ko dhul le to fir uske badan per najasat nahin rahti). Lehaza Janabat ki halat main kuch choone se woh cheez najis nahin hoti. Magar Janabat ki halat main Quran ke alfaz ko Allah ke naam ko (kisi bhi zaban main hoon kion na likha ho) Anbiya aur Aimmah (a.s) ke naam ko touch karna haram hai. Baqi sab kuch touch kar sakta hai. Magar Janabat ki halat main ziyada der baqi rahna makrooh hai. Khana pina makrooh hai. Agar khana chahta hai to kam se kam agar is waqt Ghusl nahin kar sakta to wudhu kar ke khana pina chahiye.
We know there are two types of Impurities(Najasat), Physical and Spiritual.Those that are related to physical body we call them “Hadath al Asghar” and this which are related to our spirit is called “Hadath al Akber”. Now if a person has passed wind from rear or had urination or released himself, he has to clean only that area let’s say Urinary parts and anal region and for Namaz has to do Wudhu. Incase of passing wind even no need to wash that part just has to do Wudhu.
But Incase of Janabat, Hayz, Nefas, Istehaza, and touching the dead body he/she has do wajib Ghusl before Namaz or touching the letter of Quran or entering into the mosque etc but in this case his outer body is not NAJIS therefore if he/she sits or touches any object that would not become Najis as he/she has NO AYN e NAJIS ( original najasat).