Rigvedanukramani (Madhava) 76.4

Ṛgvedānukramaṇī (Mādhava) 76.4

āptapraṇītatāmete yadi vā'pauruṣeyatām
vaidikāḥ kalpayantyevaṃ kiṃ na bāhyeṣu kalpyate