Sunan an-Nasa'i 592
سنن النسائي#592SahihIt was narrated that Az-Zuhri said:"Salim told me that his father said: 'I saw the Messenger of Allah (ﷺ), when he was in a hurry to travel, delaying Maghrib so that he could combine it with 'Isha
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 6:99