Skandapurana 1.4.43.132

1.4.43.132

vedāḥ pramāṇaṃ smṛtayaḥ pramāṇaṃ dharmārthayuktaṃ vacanaṃ pramāṇam..
naitattrayaṃ yasya bhavetpramāṇaṃ kastasya kuryādvacanaṃ pramāṇam.. 45.132 ..

The Vedas are an authority; the Smṛtis are an authority; speech endowed with righteousness and purpose is an authority. / For one to whom these three are not an authority, who would regard his word as an authority?"