It is necessary to observe caution here because the...

It is necessary to observe caution here because the practical principle (al-asl al-'amali) requires, with regards to doubtful acts, that we be cautious when we are not sure the conditions [attached to the act] are fulfilled. Moreover, the ritual impurity of a thing continues to exist (‘istishab’) as long as one is not sure that its opposite (removal of the impurity) has not occurred, as we have discussed.

The Intention ‘Niyah’ The Imamis (Shi’i) have agreed, in following the Imams out of the two weighty things [Quran being the other], on the necessity of having an intention of the ‘wudhu’ and ritual bath (ghusl)…