Sahih Muslim · Hadith 4623

حدثنا أبو بكر بن أبي شيبة، حدثنا وكيع، عن شعبة، عن سعيد بن أبي بردة، عن أبيه، عن جده، أن النبي صلى الله عليه وسلم بعثه ومعاذا إلى اليمن فقال ‏"‏ يسرا ولا تعسرا وبشرا ولا تنفرا وتطاوعا ولا تختلفا ‏"‏ ‏.‏

It has also been narrated by Sa'd b. Abu Burda through his father through his grandfather that the Prophet of Allah (may peace be upon him) sent him and Mu'adh (on a mission) to the Yemen, and said (by way of advising them): Show leniency (to the people) ; don't be hard upon them; give them glad tidings (of Divine favours in this world and the Hereafter) ; and do not create aversion. Work in collaboration and don't be divided.

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).