Yahya related to me from Malik that Yahya ibn Said said, ''Ubadaibn as-Samit used to lead the people in prayer. One day he came outfor subh and the muadhdhin began to give the iqama for the subh prayerUbada silenced him, prayed witr and then led them in subh."
App reference: Book 7, Hadith 26
USC-MSA web (English) reference: Book 7, Hadith 26
Arabic reference: Book 7, Hadith 280