كتاب الحج
15  
The Book of Pilgrimage
(47)
Chapter: Departing from 'Arafat to Al-Muzdalifah. It is recommended to pray Maghrib and 'Isha together in Al-Muzdalifah on this night
(47)
باب الإِفَاضَةِ مِنْ عَرَفَاتٍ إِلَى الْمُزْدَلِفَةِ وَاسْتِحْبَابِ صَلاَتَىِ الْمَغْرِبِ وَالْعِشَاءِ جَمْعًا بِالْمُزْدَلِفَةِ فِي هَذِهِ اللَّيْلَةِ
Sahih Muslim 1280 e

Kuraib reported that he asked Usama b. Zaid (Allah be pleased with him) What did you do in the evening of 'Arafa as you rode behind Allah's Messenger (ﷺ)? He said:

We came to a valley where people generally halted their (camels) for the sunset prayer. Allah's Messenger (ﷺ) halted his camel and urinated (and he did not say that he had poured water). He then called for water and performed light ablution. I said: Messenger of Allah, the prayer! Thereupon he said: Prayer awaits you (at Muzdalifa). and he rode on until we came to Muzdalifa. Then he offered the sunset prayer. and the people halted their camels at their places, and did not untie them until Iqama was pronounced for the 'Isha' prayer and he observed the prayer, and then they untied (their camels). I said: What did you do in the morning? He said: Al-Fadl b. Abbas (Allah be pleased with them) sat behind him (the Holy Prophet) in the morning, whereas I proceeded on foot with the Quraish who had gone ahead.
وَحَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، أَخْبَرَنَا يَحْيَى بْنُ آدَمَ، حَدَّثَنَا زُهَيْرٌ أَبُو خَيْثَمَةَ، حَدَّثَنَا إِبْرَاهِيمُ بْنُ عُقْبَةَ، أَخْبَرَنِي كُرَيْبٌ، أَنَّهُ سَأَلَ أُسَامَةَ بْنَ زَيْدٍ كَيْفَ صَنَعْتُمْ حِينَ رَدِفْتَ رَسُولَ اللَّهِ صلى الله عليه وسلم عَشِيَّةَ عَرَفَةَ فَقَالَ جِئْنَا الشِّعْبَ الَّذِي يُنِيخُ النَّاسُ فِيهِ لِلْمَغْرِبِ فَأَنَاخَ رَسُولُ اللَّهِ صلى الله عليه وسلم نَاقَتَهُ وَبَالَ - وَمَا قَالَ أَهَرَاقَ الْمَاءَ - ثُمَّ دَعَا بِالْوَضُوءِ فَتَوَضَّأَ وُضُوءًا لَيْسَ بِالْبَالِغِ فَقُلْتُ يَا رَسُولَ اللَّهِ الصَّلاَةَ ‏.‏ فَقَالَ ‏ "‏ الصَّلاَةُ أَمَامَكَ ‏"‏ ‏.‏ فَرَكِبَ حَتَّى جِئْنَا الْمُزْدَلِفَةَ فَأَقَامَ الْمَغْرِبَ ثُمَّ أَنَاخَ النَّاسُ فِي مَنَازِلِهِمْ وَلَمْ يَحُلُّوا حَتَّى أَقَامَ الْعِشَاءَ الآخِرَةَ فَصَلَّى ثُمَّ حَلُّوا قُلْتُ فَكَيْفَ فَعَلْتُمْ حِينَ أَصْبَحْتُمْ قَالَ رَدِفَهُ الْفَضْلُ بْنُ عَبَّاسٍ وَانْطَلَقْتُ أَنَا فِي سُبَّاقِ قُرَيْشٍ عَلَى رِجْلَىَّ ‏.‏
Reference : Sahih Muslim 1280e
In-book reference : Book 15, Hadith 307
USC-MSA web (English) reference : Book 7, Hadith 2944
  (deprecated numbering scheme)