Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 2


विदुर उवाचतेनैव तु मुनिश्रेष्ठ हरिणा यज्ञमूर्तिना ।आदिदैत्यो हिरण्याक्षो हत इत्यनुशुश्रुम ॥ २ ॥


vidura uvācatenaiva tu muni-śreṣṭhahariṇā yajña-mūrtināādi-daityo hiraṇyākṣohata ity anuśuśruma


Śrī Vidura said: O chief amongst the great sages, I have heard by disciplic succession that Hiraṇyākṣa, the original demon, was slain by the same form of sacrifices, the Personality of Godhead [Lord Boar].


As referred to previously, the boar incarnation was manifested in two millenniums, namely Svāyambhuva and Cākṣuṣa. In both millenniums there was a boar incarnation of the Lord, but in the Svāyambhuva millennium He lifted the earth from within the water of the universe, whereas in the Cākṣuṣa millennium He killed the first demon, Hiraṇyākṣa. In the Svāyambhuva millennium He assumed the color white, and in the Cākṣuṣa millennium He assumed the color red. Vidura had already heard about one of them, and he proposed to hear about the other. The two different boar incarnations described are the one Supreme Personality of Godhead.