Musnad Ahmad 30:1303

Abu Amir and Surayj narrated to us, they said: Fulayh narrated to us, from Hilal ibn Ali, from Ata ibn Yasar, from Abu Hurayrah, from the Prophet, may Allah bless him and grant him peace, that he said: "Indeed, the people of Paradise will visit one another therein." Surayj said: "They will see one another therein just as you see the brilliant star, and the eastern star, and the western star setting on the horizon, rising in the difference of degrees." They said: "O Messenger of Allah, are those the prophets?" He said: "Yes, by the One in Whose hand is the soul of Muhammad, [they are] peoples who believed in Allah and His Messenger, and believed the messengers." And Surayj said: "And peoples who believed in Allah."