Usama bin Zayd reported,

He heard him say, "The Messenger of Allah ﷺ departed from Arafah and descended into the mountain pass, where he relieved himself and then performed ablution, but did not perform it thoroughly."I said to him, "The prayer?"He replied, "The prayer is ahead of you."He came to Muzdalifa and performed ablution, doing it thoroughly this time. Then the call to commence prayer was made and he prayed Maghrib. After that, each person made his camel kneel at his place, then the call to commence prayer was made again and he prayed, without praying anything between the two.

Bukhari 1672

Sahih

حدثنا عبد الله بن يوسف أخبرنا مالك عن موسى بن عقبة عن كريب

عن أسامة بن زيد رضي الله عنهما

أنه سمعه يقول دفع رسول الله ﷺ من عرفة فنزل الشعب فبال ثم توضأ ولم يسبغ الوضوء فقلت له الصلاة فقال الصلاة أمامك فجاء المزدلفة فتوضأ فأسبغ ثم أقيمت الصلاة فصلى المغرب ثم أناخ كل إنسان بعيره في منزله ثم أقيمت الصلاة فصلى ولم يصل بينهما

البخاري 1672صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Hajj
Chapter
Combining the two prayers at Muzdalifa
Numbering
Darussalam 1672
Bukhari 1672