It was narrated from Ibn 'Umar that the Prophet (ﷺ) prayed Maghrib and 'Isha' at Al-Muzdalifah
Hadith No. 607
Sunan an Nasai
Gradings:
Abu Ghuddah:
Sahih
Al-Albani:
Sahih
Zubair Ali Zai:
Sahih Muslim