Sunan Ibn Majah
1633
Hasan+2

It was narrated that Ubayy bin Ka’b said:“We were with the Messenger of Allah (ﷺ) and we all had a single focus, but when he passed away we started to look here and there (i.e., have different interests).”

HasanAl-Albani
HasanMuhammad Fouad Abd al-Baqi