स नैव व्यभवत्स शौद्रं वर्णमसृजतपूषणमियं वै पूषेयँ हीदँ सर्वं पुष्यति
In plain words
Even then, Brahman did not expand fully. It then projected forth the laboring class as Pūṣan, the nourisher. For this earth itself is Pūṣan, because it nourishes all that exists.
Close to the Sanskrit
That indeed did not expand. He projected forth the śūdra class, Pūṣan. This earth verily is Pūṣan, for this nourishes all this.