Musnad Abu Ya'la al-Mawsili 155:270

'Abd al-Rahman ibn Salih al-Azdi narrated to us, Muhammad ibn Fudayl narrated to us, from 'Amarah, from Abu Zur'ah, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, among the servants of Allah are servants whom the prophets and the martyrs will envy." It was said: "Who are they, so that we may love them?" He said: "They are a people who loved one another by the light of Allah, without there being any kinship or lineage between them. Their faces will be light, and they will be upon pulpits of light. They will not fear when the people fear, and they will not grieve when the people grieve." Then he recited: "Verily, the allies of Allah—no fear will there be concerning them, nor will they grieve." (Yunus: 62)