Musnad Ahmad 28:67

Yazid narrated to us, Nafi‘ ibn ‘Umar narrated to us, from Bishr ibn ‘Asim ibn Sufyan, from his father, from ‘Abdullah ibn ‘Amr, from the Prophet (peace and blessings of Allah be upon him) — according to what Nafi‘ knows — that he said: "Indeed, Allah the Almighty hates the eloquent among men, who moves his tongue around as a cow moves its tongue around."