Hadithcore
Sahih al-Bukhari, 1111
sahih

Narrated Anas bin Malik:

Whenever the Prophet (ﷺ) started the journey before noon, he used to delay the Zuhr prayer till the time for the `Asr prayer and then he would dismount and pray them together; and whenever the sun declined before he started the journey he used to offer the Zuhr prayer and then ride (for the journey).

حَدَّثَنَا حَسَّانُ الْوَاسِطِيُّ، قَالَ حَدَّثَنَا الْمُفَضَّلُ بْنُ فَضَالَةَ، عَنْ عُقَيْلٍ، عَنِ ابْنِ شِهَابٍ، عَنْ أَنَسِ بْنِ مَالِكٍ ـ رضى الله عنه ـ قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم إِذَا ارْتَحَلَ قَبْلَ أَنْ تَزِيغَ الشَّمْسُ أَخَّرَ الظُّهْرَ إِلَى وَقْتِ الْعَصْرِ، ثُمَّ يَجْمَعُ بَيْنَهُمَا، وَإِذَا زَاغَتْ صَلَّى الظُّهْرَ ثُمَّ رَكِبَ‏.‏

References2 variants
In-Book Reference
Book 18, Hadith 31
USC-MSA web (English) reference
Vol. 2, Book 20, Hadith 213 (deprecated numbering scheme)
Sharh · explanationclick to expand
Facilitation and easiness are obvious and evident in the Islamic law. Not only is Islam the final religion that Allah has sent for the good of humanity, but also considers the different abilities and natures of human beings; and one of the forms of this easiness is the permissibility of joining the prayers while traveling. In this hadeeth, Anas ibn Maalik (may Allah be pleased with him) reports that whenever the Prophet ﷺ departed his place, i.e., when he began traveling, or he ﷺ intended to depart during the journey before “the sun reached its zenith” - which is when the sun begins to descend from its apogee in the sky, moving westward, meaning: before the time of Dhuhr began – he ﷺ would delay the Dhuhr prayer until the time for the ‘Asr prayer had entered. Then, he would combine the Dhuhr and ʿAsr prayers during the time for the ‘Asr prayer. As for Anas’ statement: “[The sun] had begun its decline from its zenith” - meaning: the time for Dhuhr had entered; and he ﷺ performed Dhuhr, then he climbed atop his mount [and continued on the journey]. The apparent meaning of the narration [at this point] indicates that the Prophet ﷺ did not combine the prayer with ʿAsr. However, in a hadeeth narrated by Abu Daawood, on the authority of Muʿaadh ibn Jabal (may Allah be pleased with him), he reports: “If he departed after the sun began to decline from its zenith, he would combine Dhuhr and ʿAsr, and then resume traveling.”. There are two ways to join between two consecutive prayers, depending on what is easier [at the time and situation at hand: First - Combining by bringing the [second] prayer forward: It is to perform the ʿAsr prayer with Dhuhr, during the time of afternoon prayer (Dhuhr); and ʿIshaa’ with Maghrib during the time for the sunset prayer (Maghrib). Second - Combining by delaying the [first] prayer: It is to perform the Dhuhr prayer with ʿAsr, during the time of the mid-afternoon prayer (ʿAsr); and Maghrib with ʿIshaa’, during the time for the night prayer (ʿIshaa’). This is all with shortening the prayers that consist of four units to two while traveling. So, the prayer is shortened and combined, while Maghrib is not shortened, and Fajr is performed separately, and is not joined with any of the others. Likewise, there is no joining between ʿAsr and Maghrib. Whoever combines two prayers, it is necessary for him to not have a long period of time separating the performance of the two prayers, respectively. If there is a long separation between the two, he does not join them, and must pray the [second] prayer during its own time. .
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