Charak Samhita
खरोऽभ्यङ्गे स्मृतः पाको, मृदुर्नस्तःक्रियासु च। मध्यपाकं तु पानार्थे बस्तौ च विनियोजयेत्॥१०४॥
[Their indications] Kharapaka sneha (dense) is mostly used for the abhyanga (unction), the mridupaka sneha (soft/thin) is ideal for administration through the nasal route (nasya), madhyama paka sneha (medium) is preferred both oral administration (pana) as well as for enema (basti).
english translation
खरोऽभ्यङ्गे स्मृतः पाको, मृदुर्नस्तःक्रियासु च। मध्यपाकं तु पानार्थे बस्तौ च विनियोजयेत्॥१०४॥
[Their indications] Kharapaka sneha (dense) is mostly used for the abhyanga (unction), the mridupaka sneha (soft/thin) is ideal for administration through the nasal route (nasya), madhyama paka sneha (medium) is preferred both oral administration (pana) as well as for enema (basti).
english translation