Markandeyapurana 48.5

48.5

yuktātmanastamomātrā udriktābhūt prajāpateḥ /
sisṛkṣorjaghanāt pūrvamasurā jajñire tataḥ //

Then being desirous of creating the four classes of beings, namely, the gods, the Asuras and the pitṛs, and mankind, he infused[3] himself in the waters. The particle of darkness grew up in excess as the Prajāpati was rapt in meditation. First then out of his buttocks, as he was desirous of creating, were produced the Asuras. And then he cast aside that body which was composed of the particle of darkness; that body cast aside by him forthwith became Night.