Digha Nikaya 1:70
SUJATOYāvakīvañca, bhikkhave, bhikkhū apaññattaṁ na paññapessanti, paññattaṁ na samucchindissanti, yathāpaññattesu sikkhāpadesu samādāya vattissanti, vuddhiyeva, bhikkhave, bhikkhūnaṁ pāṭikaṅkhā, no parihāni.
As long as the mendicants don’t make new decrees or abolish existing decrees, but undertake and follow the training rules as they have been decreed, they can expect growth, not decline.