TIPITAKA Volume 21 : PALI ROMAN Sutta Pitaka Vol 13 : Sutta. Aṅ. (2): catukkanipāto

[42] Cattārīmāni bhikkhave pañhabyākaraṇāni katamāni cattāri atthi bhikkhave pañho ekaṃsabyākaraṇīyo atthi bhikkhave pañho vibhajjabyākaraṇīyo atthi bhikkhave pañho paṭipucchābyākaraṇīyo atthi bhikkhave pañho ṭhapanīyo imāni kho bhikkhave cattāri pañhabyākaraṇānīti. Ekaṃsavacanaṃ ekaṃ vibhajjavacanāparaṃ tatiyaṃ paṭipuccheyya catutthaṃ pana ṭhāpaye. Yo ca nesaṃ tattha tattha jānāti anudhammataṃ catupañhassa kusalo āhu bhikkhuṃ tathāvidhaṃ. Durāsado duppasaho gambhīro duppadhaṃsiyo atho atthe anatthe ca ubhayatthassa 1- kovido anatthaṃ parivajjeti atthaṃ gaṇhāti paṇḍito atthābhisamayā dhīro paṇḍitoti pavuccatīti.