Skandapurana 16.19.79

16.19.79

kartuṃ dharmavyavasthānamasurāṇāṃ praṇāśanaḥ ..
pūrvajanmani viṣṇuḥ sa pramatirnāma vīryavān .. 79 ..

to establish the system of dharma, destroyer of the asuras. / In a previous birth, that heroic Viṣṇu was named Pramati;