Hadithcore
Riyad as-Salihin, 1118

'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). <b>[At-Tirmidhi]</b>.

وعن عائشة رضي الله عنها أن النبي صلى الله عليه وسلم كان إذا لم يصلِ أربعًا قبل الظهر، صلاهن بعدها‏.‏ ‏(‏‏(‏رواه الترمذي وقال‏:‏ حديث حسن‏)‏‏)‏‏.‏

References1 variant
In-Book Reference
Book 8, Hadith 128
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) It is legitimate for a person to make up for supererogatory prayers which he misses at the appointed times, if he usually performs them.<br> 2) When the Prophet (may Allah’s peace and blessings be upon him) did an act of worship, he would do it on a regular basis.<br> Note:<br> If a person misses the pre-Zhuhr Sunnah prayer, he makes up for it after offering the post-Zhuhr Sunnah prayer, as indicated by a Hadith in which ‘Ā’ishah (may Allah be pleased with her) reported: “Whenever the Messenger of Allah (may Allah’s peace and blessings be upon him) missed the four Rak‘ahs before the Zhuhr prayer, he would offer them after offering the two-Rak‘ah Sunnah after Zhuhr.” [Narrated by Ibn Mājah; no. 1158]