Yahya related to me from Malik that Yahya ibn Said said, ''Ubadaibn al-Walid ibn Ubada ibn as-Samit informed me from his father thathis grandfather (Ubada) said, 'We made a contract with the Messengerof Allah, may Allah bless him and grant him peace, to hear and obey inease and hardship, enthusiasm and reluctance, and not to dispute withpeople in authority and to speak or establish the truth wherever wewere without worrying about criticism.'"
USC-MSA web (English) reference: Book 21, Hadith 5
Arabic reference: Book 21, Hadith 966