Charak Samhita
सान्द्रं गोधूमचूर्णानां पादं स्तीर्णे शिलातले। शुचौ श्लक्ष्णे समुत्कीर्य मर्दनेनोपपादयेत् ॥३४॥
After that it should be mixed with 25 palas of wheat flour and the paste then prepared should be spread over a clean and smooth stone slab.
english translation
sAndraM godhUmacUrNAnAM pAdaM stIrNe zilAtale। zucau zlakSNe samutkIrya mardanenopapAdayet ॥34॥
hk transliteration by Sanscript