Aaga, May I know, if the blood is Najis when it is flown out of the body. (In general for all Human Beings)

Is there exceptions for Blood being NOT Najis of Prophets and Imams or Shohada or Awliya ?

If yes, then how to understand it? please elaborate.

Yes all human blood is Najes. As for the Prophet (s) and Imams (a), a group of scholars believe it’s pure because in 33:33 Allah tells us in they were thoroughly purified, which includes physical and spiritual purity. Not all scholars agree, but many do.