“This is about the words of Allah, most Blessed is whose name, ‘Salah (prayer) was written as obligatory upon people.’ (4:103) Abu Ja’far (a.s.), has said, ‘It means that it was obligatory, not that it is obligatory for a limited time so that if it is performed after the limited time, it does not fulfill the obligation. Had it been so Sulayman son of Dawud would have been destroyed when he performed his Salah (prayer) in a time, which was other than the time of that Salah (prayer). However, he performed when he remembered.’ He (the Imam) then said, ‘If you are certain or have doubts in its time that you did not perform, you must perform it again. If you face a doubt after its time has ended, there has an obstacle come into existence, so a repeat is not required from you because of doubt, unless you are certain. If you become certain you must perform in whatever condition you are.’”