Dutiyaniddasasutta 2.2

2.2

“yo hi koci, āvuso, dvādasavassāni paripuṇṇaṃ parisuddhaṃ brahmacariyaṃ carati, ‘niddaso bhikkhū’ti alaṃvacanāyā”ti.

“Reverends, anyone who lives the full and pure spiritual life for twelve years is qualified to be called a ‘graduate mendicant’.”