Musannaf Ibn Abi Shayba 18:201

Abu Bakr narrated to us, he said: Abd al-Rahim ibn Sulayman narrated to us, from Ash'ath, from al-Zuhri, who attributed it (to the Prophet), he said: The Messenger of Allah (peace be upon him) said regarding the tongue: "If it is completely eradicated, the blood money is full."