Agnipurana 252.45

252.45

na cāhūto vadet kiñciddhanī daṇḍyaś ca sa smṛtaḥ /
sākṣiṣūbhayataḥ satsu sākṣiṇaḥ pūrvavādinaḥ //

and who, when summoned, says nothing—he is considered liable to punishment. / When there are witnesses on both sides, the witnesses of the plaintiff [are heard];