Anandakanda 1.1.59

1.1.59

taṃ rasendraṃ śucirbhūtvā gṛhṇīyādrasadeśikaḥ /
gauravādagnivadanāt patito daradāhvaye //

the master of alchemical practice, having purified himself, should collect that lord of mercury. / Because of its heaviness, it fell from the mouth of Agni into the country called Darada;