Whenever the Prophet (ﷺ) started on a journey before noon, he used to delay the Zuhr prayers till the time for the 'Asr prayer and then he would dismount and offer them together; and whenever the sun declined before he started on a journey he used to offer the Zuhr prayers and then ride (for journey).
Reference: Sahih al-Bukhari 1112 In-book : Book 18, Hadith 32 USC-MSA web (English) : Vol. 2, Book 20, Hadith 213 (deprecated)
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