Imam

Therefore in every epoch (after Mohammed) a saint arises (to act as his vicegerent): the probation (of the people) lasts until the Resurrection. Whosoever has a good disposition is saved; whosoever is of frail heart is broken. That saint, then, is the living Imám who arises (in every age), a descendant of ‘Alí. He is the Mahdí (the God-ion is saved; whosoever is of frail heart is broken. That saint, then, is the living Imám who arises (in every age), whether he be a descendant of ‘Umar or of ‘Alí. He is the Mahdí (the God-guided one) and the Hádí (the Guide), O seeker of the (right) way: he is both hidden (from you) and seated before your face.

The Masnawi - Volume 2, 815