Salim bin Aswad reported,

Ati reported, I came with Ibn Umar from Arafat to Muzdalifa, and he did not cease saying takbir and tahlil until we reached Muzdalifa. He gave the call to prayer and the iqamah, or he ordered a man to give the call to prayer and the iqamah, and he led us in the Maghrib prayer of three rakahs. Then he turned to us and said, "The prayer." So he led us in the Isha prayer of two rakahs, then he called for his supper.

Azami 5139

Sahih

عن أشعث بن سليم عن أبيه قال

أقبلت مع ابن عمر من عرفات إلى المزدلفة فلم يكن يفتر من التكبير والتهليل حتى أتينا المزدلفة، فأذن وأقام أو أمر إنسانا فأذن وأقام فصلى بنا المغرب ثلاث ركعات، ثم التفت إلينا فقال: الصلاة فصلى بنا العشاء ركعتين، ثم دعا بعشائه.

الأعظمي 5139صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Hajj
Chapter
Description of the Hajj of the Prophet ﷺ as narrated by Jabir and others, and the rulings mentioned therein
Section
Combining Maghrib and Isha prayers at Muzdalifa with one adhan and two iqamas, without praying voluntary prayers between them or after them
Numbering
Jami al-Kamil 5139 (2nd edition)