Charak Samhita
तस्मात्तान् पूर्वसञ्जल्पे सर्वत्राष्टकमादिशेत्। परावरपरीक्षार्थं तत्र शास्त्रविदां बलम् ॥७३॥
Therefore, to assess their knowledge in this science and their superiority or inferiority, one should put forward the eight kinds of questions (mentioned previously) to them before a formal discussion.
english translation
tasmAttAn pUrvasaJjalpe sarvatrASTakamAdizet। parAvaraparIkSArthaM tatra zAstravidAM balam ॥73॥
hk transliteration by Sanscript