Sunan Ibn Majah 701
سنن ابن ماجه#701SahihIt was narrated that Abu Barzah Al-Aslami said:"The Messenger of Allah used to like to delay the 'Isha', and he disliked sleeping before it, and engaging in conversation after it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih Bukhari
In-book reference: 2:35