If the Prophet (sallallahu alayhi wa sallam) could not perform four Rakah before Zuhr prayer, he would perform them after it (i.e., after the obligatory prayer).
وعن عائشة رضي الله عنها
أن النبي صلى الله عليه وسلم كان إذا لم يصلِ أربعًا قبل الظهر، صلاهن بعدها
If the Prophet (sallallahu alayhi wa sallam) could not perform four Rakah before Zuhr prayer, he would perform them after it (i.e., after the obligatory prayer).
Who passed it on, from Imam an-Nawawi back to the one who was there.
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