Musnad Abu Ya'la al-Mawsili 42:305

From Abu Sa'id, who said: I heard the Prophet, may Allah bless him and grant him peace, saying: "Indeed, the people of 'Illiyyin are seen by those who are below them just as you see the brilliant star in the horizon of the sky. And indeed, Abu Bakr and 'Umar are among them, and they have been favored."