योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-60, verse-59

धरापीठैकपूर्णेषु तिष्ठन्त्यन्येषु देहिनः ।
भेका इव शिलाकोशे कीटा इव धरोदरे ॥ ५९ ॥

dharāpīṭhaikapūrṇeṣu tiṣṭhantyanyeṣu dehinaḥ ,
bhekā iva śilākośe kīṭā iva dharodare 59

59. So the surface of the earth, and air and water, teem with living beings, and the frogs live in the cell of stones, and the insects dwell in the womb of the earth.