Titthayatanasutta 3.2

3.2

Iti karaṇīyākaraṇīye kho pana saccato thetato anupalabbhiyamāne muṭṭhassatīnaṃ anārakkhānaṃ viharataṃ na hoti paccattaṃ sahadhammiko samaṇavādo.

Not finding as a genuine fact that there are things that should and should not be done, they’re unmindful and careless, and can’t rightly be called ascetics.