Charak Samhita
पलाभ्यां पिप्पलीमूलनागरादष्टकट्वरः । तैलप्रस्थः समो दध्ना गृध्रस्यूरुग्रहापहः ॥४७॥
One prastha of oil (768 grams) should be cooked by adding two palas (96 grams) of pippalimoola and nagara taken together, 8 prasthas of katvara (butter milk) and one prastha of yogurt. This medicated oil cures gridhrasi (sciatica) and urustambha.
english translation
palAbhyAM pippalImUlanAgarAdaSTakaTvaraH । tailaprasthaH samo dadhnA gRdhrasyUrugrahApahaH ॥47॥
hk transliteration by Sanscript