Furthermore, an individual meditates spreading a heart full of compassion … rejoicing … equanimity to one direction, and to the second, and to the third, and to the fourth. In the same way above, below, across, everywhere, all around, they spread a heart full of equanimity to the whole world—abundant, expansive, limitless, free of enmity and ill will. They contemplate the phenomena there—included in form, feeling, perception, choices, and consciousness—as impermanent, as suffering, as diseased, as a boil, as a dart, as gloom, as an affliction, as alien, as breaking apart, as empty, as not-self. When their body breaks up, after death, they’re reborn in the company of the gods of the pure abodes. This rebirth is distinct from that of ordinary people. These are the four individuals found in the world.”

Numbered Discourses 4.127 13. Fears Incredible Things About the Realized One (1st)

“Mendicants, with the appearance of a Realized One, a perfected one, a fully awakened Buddha, four incredible and amazing things appear. What four? When the being intent on awakening passes away from the host of joyful gods, he’s conceived in his mother’s womb, mindful and aware. And then—in this world with its gods, Māras, and divinities, this population with its ascetics and brahmins, gods and humans—an immeasurable, magnificent light appears, surpassing the glory of the gods. Even in the boundless gloom of interstellar space—so utterly dark that even the luminosity of the moon and the sun, so mighty and powerful, makes no impression—an immeasurable, magnificent light appears, surpassing the glory of the gods. And the sentient beings reborn there recognize each other by that light: ‘So, it seems other sentient beings have been reborn here!’ This is the first incredible and amazing thing that appears with the appearance of a Realized One.