CC Ādi 1.67

brahmā viṣṇu śiva — tina guṇāvatāre gaṇi
śakty-āveśa — sanakādi, pṛthu, vyāsa-muni
Synonyms: 
brahmā — Lord Brahmā; viṣṇu — Lord Viṣṇu; śiva — Lord Śiva; tina — three; guṇa-avatāre — among the incarnations controlling the three modes of material nature; gaṇi — I count; śakti-āveśa — empowered incarnations; sanaka-ādi — the four Kumāras; pṛthu — King Pṛthu; vyāsa-muni — Vyāsadeva.
Translation: 
Brahmā, Viṣṇu and Śiva are qualitative incarnations. Empowered incarnations are those like the Kumāras, King Pṛthu and Mahāmuni Vyāsa [the compiler of the Vedas].