SB 10.85.3
krsna krsna maha-yogin
sankarsana sanatana
jane vam asya yat saksat
pradhana-purusau parau
Translation:
[Vasudeva said:] O Krsna, Krsna, best of yogis, O eternal Sankarsana! I know that You two are personally the source of universal creation and the ingredients of creation as well.
Purport:
As taught in the Sankhya doctrine of Lord Kapiladeva, pradhana is the creative energy of the purusa, the Supreme Person. Thus, of these two principles, the pradhana is the predominated energy, female, incapable of independent action, while the purusa is the absolutely independent, primeval creator and enjoyer. Neither Krsna nor His brother Balarama belong to the category of subordinate energy; rather, both of Them together are the original purusa, who is always joined by His manifold potencies of pleasure, knowledge and creative emanation.