The Compendium of Caraka 8.3.19

8.3.19

snigdhe gude netracaturthabhāgaṃ snigdhaṃ &śanairṛjvanu pṛṣṭhavaṃśam/
akampanāvepanalāghavādīn pāṇyorguṇāṃścāpi &vidarśayaṃstam//

Into the unctuous rectum, a fourth part of the pipe, lubricated, straight, slowly, along the vertebral column,
while demonstrating the virtues of the hands, such as absence of trembling, absence of shaking, and lightness,