Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 9

Sanskrit:

तत्कर्दमाश्रमपदं सरस्वत्या परिश्रितम् ।स्वयम्भू: साकमृषिभिर्मरीच्यादिभिरभ्ययात् ॥ ९ ॥

ITRANS:

tat kardamāśrama-padaṁsarasvatyā pariśritamsvayambhūḥ sākam ṛṣibhirmarīcy-ādibhir abhyayāt

Translation:

Brahmā, the first-born living being, went along with Marīci and other sages to the place of Kardama’s hermitage, which was surrounded by the river Sarasvatī.

Purport:

Brahmā is called Svayambhū because he is not born of any material father and mother. He is the first living creature and is born from the lotus which grows from the abdomen of the Supreme Personality of Godhead, Garbhodakaśāyī Viṣṇu. Therefore he is called Svayambhū, self-born.