Pratimoksha of the Dharmaguptakas 1.141

1.141

「若比丘！知年不滿二十，與受大戒，此人不得戒；彼比丘可呵，癡故，波逸提。

A man fully twenty years of age may be permitted to undertake the full ordination. If a monk not fully twenty years old, present himself for ordination, this man cannot be received into orders, the presiding monk is to be blamed, on account of the foolish mistake, and (the whole transaction) is pācittiya.