Usama bin Zayd reported,

He heard him say, the Messenger of Allah ﷺ departed from Arafat, and when he reached the mountain pass, he dismounted, relieved himself, then performed ablution without doing it thoroughly.I said to him, "The prayer?"He replied, "The prayer is ahead of you."He then mounted, and when he arrived at Muzdalifa, he dismounted and performed ablution, this time thoroughly. The call to begin the prayer was made, and he prayed Maghrib. Then each person made his camel kneel at his place of lodging. Afterward, the call for Isha was made, and he prayed it, without performing any prayer in between.

Muslim 3099

Sahih

حدثنا يحيى بن يحيى قال قرأت على مالك عن موسى بن عقبة عن كريب مولى ابن عباس

عن أسامة بن زيد

أنه سمعه يقول دفع رسول الله ﷺ من عرفة حتى إذا كان بالشعب نزل فبال ثم توضأ ولم يسبغ الوضوء فقلت له الصلاة قال الصلاة أمامك فركب فلما جاء المزدلفة نزل فتوضأ فأسبغ الوضوء ثم أقيمت الصلاة فصلى المغرب ثم أناخ كل إنسان بعيره في منزله ثم أقيمت العشاء فصلاها ولم يصل بينهما شيئا

مسلم 3099صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Hajj
Chapter
Departing from Arafat to Muzdalifa and the recommendation of praying Maghrib and Isha combined at Muzdalifa on this night
Numbering
Darussalam 3099
Muslim 3099