Majjhima Nikaya 3:126

Yasmiṁ samaye, bhikkhave, bhikkhu tathāsato viharanto taṁ dhammaṁ paññāya pavicinati pavicayati parivīmaṁsaṁ āpajjati, dhammavicayasambojjhaṅgo tasmiṁ samaye bhikkhuno āraddho hoti, dhammavicayasambojjhaṅgaṁ tasmiṁ samaye bhikkhu bhāveti, dhammavicayasambojjhaṅgo tasmiṁ samaye bhikkhuno bhāvanāpāripūriṁ gacchati.