Śrāddha-kalpa: Amarakantaka–Tīrtha-Māhātmya and Akṣaya Pitṛ-Tarpaṇa
पुतो भवति वै स्नात्वा हुत्वा दत्त्वा तथैव च / शेलसानुषु शृङ्गेषु कन्दरेषु गुहासु च
puto bhavati vai snātvā hutvā dattvā tathaiva ca / śelasānuṣu śṛṅgeṣu kandareṣu guhāsu ca
By bathing, offering the homa, and giving gifts, one indeed becomes purified—even upon mountain slopes and peaks, in ravines, and in caves.