Madhvaon Brahma Sūtra 1.4.25
Dvaita Vedānta
Numbered 1.4.26 in this text
Sūtra
साक्षाच्चोभयाम्नानात्
sākṣāccobhayāmnānāt
Sūtra translation
And because He (Vishnu) is directly spoken of as both (Prakriti and Purusha).
“ He is woman; He is man; He is Prakriti; He is the (Purusha) Lord; He is Brahman; He is the support; He is the light, who is the Lord Hari, the cause of all; Himself without beginning or end, but the end of all; the highest of the high ; the original present in all.” In this text of the Paingins, He is (directly) explicitly spoken of as both Prakriti and Purusha.