O brāhmaṇas, in the ninth incarnation, the Lord, prayed for by sages, accepted the body of a king [Pṛthu] who cultivated the land to yield various produce, and for that reason the earth was beautiful and attractive.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
ऋषिभिर्याचितो भेजे नवमं पार्थिवं वपुः । दुग्धेमामोषधीर्विप्रास्तेनायं स उशत्तमः
ṛṣibhiryācito bheje navamaṃ pārthivaṃ vapuḥ | dugdhemāmoṣadhīrviprāstenāyaṃ sa uśattamaḥ
SB 1.3.14