Musannaf Ibn Abi Shayba 13:2315

Abu Bakr narrated to us, he said: Sufyan ibn 'Uyaynah narrated to us, from al-Zuhri, from 'Ata' ibn Yazid, from Abu Sa'id al-Khudri, that the Prophet (peace and blessings of Allah be upon him) forbade *al-munabadhah* and *al-mulamasah*.