Q: In your esteemed opinion, what are the instances for changing the intention, i.e. to change one’s prayer, during obligatory prayer?
A: Changing one’s intention is obligatory in the following instances: i. From afternoon to noon prayer, when one realizes during prayer that he/she has not performed the noon prayer. ii. From ‘ishā’ to maghrib prayer, when one realizes during prayer, and before passing the point for changing one’s intention, that one has not performed the maghrib prayer. iii. When one is obliged to perform two qaḍā’ prayers that are to be performed in order, but forgetfully begins with the latter before performing the former.