Charak Samhita
साधयित्वा भिषक् स्नेहं नस्तः कुर्याद्विधानवित्प्राक्सूर्ये मध्यसूर्ये वा प्राक्कृतावश्यकस्य च॥९८॥
With these mentioned drugs the sneha should be prepared and used by the physician who is skillful in the errhine therapy. ॥ Procedure of nasya therapy॥ Tarpana sneha nasya should be administered into the nostrils of a patient in the early morning
english translation
sAdhayitvA bhiSak snehaM nastaH kuryAdvidhAnavitprAksUrye madhyasUrye vA prAkkRtAvazyakasya ca॥98॥
hk transliteration by Sanscript