Garudapurana 1.213.30

1.213.30

pareṣāṃ śaucaśiṣṭācca śmaśānācca mṛdaṃ tyajet /
ekāṃ liṅge mṛdaṃ dadyādvāma haste mṛdaṃ dvidhā //

from earth left over from another's purification, and from a cremation ground, one must avoid taking clay. / One should apply clay once to the penis, and twice to the left hand;