Lord Brahmā said: When the unlimitedly powerful Lord assumed the form of a boar as a pastime, just to lift the planet earth, which was drowned in the great ocean of the universe called the Garbhodaka, the first demon [Hiraṇyākṣa] appeared, and the Lord pierced him with His tusk.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
ब्रह्मोवाच । यत्रोद्यतः क्षितितलोद्धरणाय बिभ्रत्- क्रौडीं तनुं सकलयज्ञमयीमनन्तः । अन्तर्महार्णव उपागतमादिदैत्यं तं दंष्ट्रयाद्रिमिव वज्रधरो ददार
brahmovāca | yatrodyataḥ kṣititaloddharaṇāya bibhrat- krauḍīṃ tanuṃ sakalayajñamayīmanantaḥ | antarmahārṇava upāgatamādidaityaṃ taṃ daṃṣṭrayādrimiva vajradharo dadāra
SB 2.7.1