Musannaf Ibn Abi Shayba 33:1054

Ibn Mahdi narrated to us, from Sufyan, from al-Ala’ ibn al-Musayyab, from Abu al-Duha, regarding His saying: "Verily, the allies of Allah, no fear shall be upon them, nor shall they grieve." He said: They are those who, when they are seen, Allah is remembered.