Musannaf Ibn Abi Shayba 33:714

Affan narrated to us, he said: Hammad bin Salamah narrated to us, he said: Ata bin al-Sa’ib informed us that: When Abu al-Bakhtari and his companions would hear one of them being praised, or if vanity entered him, he would fold his shoulders and say: "I have humbled myself for Allah."