SB 4.17.3

विदुर उवाच
कस्माद्दधार गोरूपं धरित्री बहुरूपिणी ।
यां दुदोह पृथुस्तत्र को वत्सो दोहनं च किम् ॥३॥

vidura uvāca
kasmād dadhāra go-rūpaṁ
dharitrī bahu-rūpiṇī
yāṁ dudoha pṛthus tatra
ko vatso dohanaṁ ca kim

viduraḥ uvāca - Vidura inquired; kasmāt - why; dadhāra - took; go-rūpam - the shape of a cow; dharitrī - the earth; bahu-rūpiṇī - who has many other forms; yām - whom; dudoha - milked; pṛthuḥ - King Pṛthu; tatra - there; kaḥ - who; vatsaḥ - the calf; dohanam - the milking pot; ca - also; kim - what.

Text

Vidura inquired from the great sage Maitreya: My dear brāhmaṇa, since mother earth can appear in different shapes, why did she take the shape of a cow? And when King Pṛthu milked her, who became the calf, and what was the milking pot?

Purport

Srimad Bhagavatam. Canto 4: Creation of the Fourth Order

Chapter 17: Maharaja Prithu Becomes Angry at the Earth. Text 3

Vidura inquired from the great sage Maitreya: My dear brāhmaṇa, since mother earth can appear in different shapes, why did she take the shape of a cow? And when King Pṛthu milked her, who became the calf, and what was the milking pot?