Verse 36

कदाचित्प्रथमं पृथ्वी स्फारतामधिगच्छति ।ततः प्रजायते ब्रह्मा पार्थिवोऽसौ प्रजापतिः

In plain words

Sometimes earth is the first to attain its fullness; then Brahmā is born from it, that Prajāpati, the earthly one.