464 - Harb ibn Isma'il al-Kirmani informed me, saying: I said to Ishaq—meaning Ibn Rahwayh—regarding the saying of the Prophet (peace and blessings of Allah be upon him) to 'Ali: 'You will be my aide in the watering of my Hawd (Cistern):' He said: 'It is in this world; he defends it, invites people to it, and clarifies matters to them, and similar words [to that effect], except that it is in this world.'