Charak Samhita
नस्तः स्नेहाङ्गुलिं दद्यात् प्रातर्निशि च सर्वदा। न चोच्छिङ्घेदरोगाणां प्रतिमर्शः स दार्ढ्यकृत्॥११७॥
In the morning, night and at all times, one should use an oleated finger for pratimarsha. It should not be inhaled deeply. It is suitable for healthy and serves to strengthen the head.
english translation
nastaH snehAGguliM dadyAt prAtarnizi ca sarvadA। na cocchiGghedarogANAM pratimarzaH sa dArDhyakRt॥117॥
hk transliteration by Sanscript