It was narrated from Ibn 'Umar that if the Messenger of Allah (ﷺ) was in a hurry to travel, he would combine Maghrib and 'Isha
Hadith No. 598
Sunan an Nasai
Gradings:
Abu Ghuddah:
Sahih
Al-Albani:
Sahih
Zubair Ali Zai:
Sahih