Musannaf Ibn Abi Shayba 33:705

Waki’ narrated to us, from al-A’mash, from Mis’ar, from ‘Ali ibn al-Aqmar, from Abu al-Ahwas, who said: A man would approach the tent and find them having a buzzing sound like the buzzing of bees. So what is the matter with these people, that they feel secure about what those people used to fear?