General Behavior (Kitab Al-Adab)

Dawud :: Book 41 : Hadith 4927

Narrated Jarir:

I swore allegiance to the Apostle of Allah (peace_be_upon_him) promising to hear and obey, and behave sincerely towards every Muslim. AbuZur'ah said: Whenever he sold and bought anything, he would say: What we took from you is dearer to us than what we gave you. So choose (as you like).