Sahih al-Bukhari 1110

Arabic

حَدَّثَنَا إِسْحَاقُ، حَدَّثَنَا عَبْدُ الصَّمَدِ، حَدَّثَنَا حَرْبٌ، حَدَّثَنَا يَحْيَى، قَالَ حَدَّثَنِي حَفْصُ بْنُ عُبَيْدِ اللَّهِ بْنِ أَنَسٍ، أَنَّ أَنَسًا ـ رضى الله عنه ـ حَدَّثَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَجْمَعُ بَيْنَ هَاتَيْنِ الصَّلاَتَيْنِ فِي السَّفَرِ‏.‏ يَعْنِي الْمَغْرِبَ وَالْعِشَاءَ‏.‏

English translation

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, Book of Shortening the Prayers (At-Taqseer). English translation by Dr. Muhammad Muhsin Khan.