Vishnupurana 1.5.p3.2

1.5.p3.2

And having created the ancestors, the Lord renounced that form also. And on being renounced, the same became Twilight, remaining between day and night. And then he assumed a person filled with the principle of passion; and, O foremost of the twice-born ones, thereat sprang men fierce, with passion entering into their composition. And the lord of creatures speedily resigned that form also,—And it became Moonlight, which is termed prāksandhydā. And therefore it is, O Maitreya, man and the Pitris, become powerful in Moonlight and Twilight. Moonlight, Night, Day, and Twilight,—these four, are the bodies of Brahmā, endowed with the three principles. And then he assumed another body filled with the principle of passion, and thereat sprung Hunger from Brahmā, and from Hunger, wrath. Then the reverend one in the dark created beings frightful and bearded, and always exercised with hunger. And (as soon as these) were created, they rushed at the Lord. And of those that cried,—‘Ho! don't do this,—save him,'—are Rakshas; and others that said,—‘We shall eat him up,'—are Yakshas, from Yakshana eating. Seeing them mischievous, the hair of the Deity fell off,—and having fallen off from his head, it again rose to his head. And from their movement (sarpana), the hair became sarpas, —and from their having fallen off, they are known as ahis. Then the creator of the universe, waxing wroth, generated some beings of wrathful souls. Twenty-hued, they are beings subsisting on flesh.