عن ابن عمر رضي الله عنهما قال‏:‏ صليت مع رسول الله صلى الله عليه وسلم ركعتين قبل الظهر، وركعتين بعدها‏.‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏

'Aishah (May Allah be pleased with her) reported

If the Prophet (ﷺ) could not perform four Rak'ah before Zuhr prayer, he would perform them after it (i.e., after the obligatory prayer).[At-Tirmidhi].