The World Federation One Stop Fiqh

Ruling 1365

If during prayers one remembers that one or more prayers of that day have become qaḍāʾ, or that he has only one qaḍāʾ prayer from the past, in the event that there is ample time and it is possible for him to change his intention to qaḍāʾ prayers, it is better that he changes his intention to qaḍāʾ prayers if the prime time for the daily prayer he was performing does not expire. For example, if in ẓuhr prayers before the rukūʿ of the third rakʿah he remembers that the ṣubḥ prayer of that day had become qaḍāʾ, then in case the prime time remaining for him to perform ẓuhr prayers is not tight, he should change his intention to ṣubḥ prayers and complete his prayer as a two rakʿah prayer and then perform ẓuhr prayers. However, if the prime time remaining for ẓuhr is tight or he cannot change his intention to qaḍāʾ prayers – for example, he remembers in the rukūʿ of the third rakʿah of ẓuhr prayers that he has not performed ṣubḥ prayers – then, if he were to change his intention to ṣubḥ prayers, it would mean that he will have performed an additional rukūʿ, which is a rukn, and therefore, in such a case he must not change his intention to the qaḍāʾ of ṣubḥ prayers.