Musannaf Ibn Abi Shayba 37:150

'Abdullah ibn Idris narrated to us, from Muhammad ibn 'Ajlan, from Bukayr ibn 'Abdullah ibn al-Ashajj, who said: 'Ubadah ibn al-Samit said to Junadah ibn Abi Umayyah al-Ansari: "Come, so that I may inform you of what is for you and what is against you. Indeed, upon you is hearing and obeying in your hardship and your ease, and in your willingness and your unwillingness, and even if preference is given over you. And that you speak with your tongue, and that you do not dispute the authority with those who possess it, unless you see clear disbelief (kufr bawwah)."