Musannaf Ibn Abi Shayba 30:148

Abdullah ibn Numayr narrated to us, from Humayd ibn ‘Ata’, from Abdullah ibn al-Harith, from Ibn Mas‘ud, from the Prophet (peace and blessings of Allah be upon him), who said: "Those who love one another for the sake of Allah will be upon a pillar of red jacinth. At the top of the pillar are seventy thousand chambers, overlooking the people of Paradise. When one of them looks out, his beauty fills the houses of the people of Paradise just as the sun fills the houses of the people of the world with its light." He said: "The people of Paradise will say, 'Let us go out to those who love one another for the sake of Allah.' So they will go out and look at their faces, which will be like the moon on the night of the full moon. They will be wearing green garments, and written upon their faces will be: 'These are those who love one another for the sake of Allah.'"