(14) باب هَلْ يُؤَذِّنُ أَوْ يُقِيمُ إِذَا جَمَعَ بَيْنَ الْمَغْرِبِ وَالْعِشَاءِ
Narrated Anas bin Malik:
Whenever the Prophet (ﷺ) started a journey before noon, he used to delay the Zuhr prayer till the time of `Asr and then offer them together; and if the sun declined (at noon) he used to offer the Zuhr prayer and then ride (for the journey).
Reference: Sahih al-Bukhari 1110
In-book reference: Book 18, Hadith 30
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 20, Hadith 212