Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 48-49
Sanskrit:
अस्मिन्नप्यन्तरे ब्रह्मन् भगवान्लोकभावन: ।ब्रह्मेशाद्यैर्लोकपालैर्याचितो धर्मगुप्तये ॥ ४८ ॥पराशरात् सत्यवत्यामंशांशकलया विभु: ।अवतीर्णो महाभाग वेदं चक्रे चतुर्विधम् ॥ ४९ ॥
ITRANS:
asminn apy antare brahmanbhagavān loka-bhāvanaḥbrahmeśādyair loka-pālairyācito dharma-guptaye
Translation:
O brāhmaṇa, in the present age of Vaivasvata Manu, the leaders of the universe, led by Brahmā and Śiva, requested the Supreme Personality of Godhead, the protector of all the worlds, to save the principles of religion. O most fortunate Śaunaka, the almighty Lord, exhibiting a divine spark of a portion of His plenary portion, then appeared in the womb of Satyavatī as the son of Parāśara. In this form, named Kṛṣṇa Dvaipāyana Vyāsa, he divided the one Veda into four.