Musannaf Ibn Abi Shayba 28:1185

Waki' narrated to us, he said: Al-A'mash narrated to us, from 'Umarah, who said: 'Utrays ibn 'Arqoub—or Ma'dad, Al-A'mash was uncertain—said: "I do not care whether I obeyed a man in disobedience to Allah, or whether I prostrated to this tree."