Musnad Ahmad 30:1351

Fazarah narrated to us, he said: Fulayh informed me, from Hilal—meaning Ibn Ali—from Ata, from Abu Hurairah, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, the people of Paradise will see one another in Paradise just as you see—or you behold—the brilliant star setting on the horizon or rising, due to the difference in their ranks." They said: "O Messenger of Allah, are those the prophets?" He said: "Yes, by the One in Whose hand is my soul, and [also] people who believed in Allah and affirmed the messengers."