all his prayers after that day were shorter (1). The wording does not indicate this. Had this been what was meant, it would not have escaped his rightly guided caliphs, leaving them to adhere to what had been abrogated and abandon what superseded it.
As for his saying (peace and blessings be upon him), “Whoever among you leads the people in prayer should keep it brief” (2), and Anas’s statement, “The Messenger of Allah (peace and blessings be upon him) kept his prayers shorter than anyone else, while performing them fully” (3), brevity is relative: it is measured against what the Prophet (peace and blessings be upon him) did and consistently practised, not against the preferences of those praying behind him. He would not command them to do something and then act contrary to it. He knew that among those praying behind him were the elderly, the weak, and those with pressing needs. Thus, his own practice exemplified the brevity he commanded. His prayers could have been many times longer than they were (4), so they were brief in comparison with longer prayers. The practice he consistently maintained is the standard by which every disputed matter is to be judged.
This is supported by what al-Nasā’ī (5) and others narrated from Ibn ‘Umar, who said: “The Messenger of Allah (peace and blessings be upon him) would instruct us to keep the prayer brief, yet lead us in prayer reciting al-Sāffāt (Those Ranged in Rows).” Thus, reciting al-Sāffāt (Those Ranged in Rows) falls within the brevity he commanded. And Allah knows best.