The Sangha without offence for five years after the Awakening (Mahāsāṃghika Vinaya)

The Chinese Mahāsāṃghika Vinaya says: “For five years after the World-honoured One's awakening, the community of monks was entirely pure; from then on they gradually did wrong, and the World-honoured One laid down rules as each case arose.” That is, for five years after the Awakening the monks were pure and without fault, and only afterwards did some gradually do wrong, whereupon the Buddha laid down rules case by case and began to recite the Pātimokkha (the text listing the monastic rules). The text goes on to list the four ways of receiving full ordination, and the names of those whom the Buddha himself ordained with “Come, bhikkhu” (the words the Buddha spoke when ordaining someone), from the first five disciples and the three Kassapa brothers to Sāriputta, Moggallāna and the five hundred Sakyans. Source text