Mahavagga, Khandaka 1, Chapter 35

1, 2. At that time ignorant, unlearned Bhikkhus (who said), 'We have completed ten years (since our upasampadā), we have completed ten years,' gave a nissaya (i.e. they received young Bhikkhus as their antevāsikas); (thus) ignorant ācariyas were found and clever antevāsikas; unlearned ācariyas were found and learned antevāsikas; ācariyas were found who had small knowIedge, and antevāsikas who had great knowledgc; foolish ācariyas were found and wise antevāsikas. The moderate Bhikkhus were annoyed (&c., as in chap. 31, 7, 8).

'Let no ignorant, unlearned Bhikkhu, O Bhikkhus, give a nissaya. If he does, he is guilty of a dukkaṭa offence. I prescribe, O Bhikkhus, that only a learned, competent Bhikkhu who has completed ten years, or more than ten years, may give a nissaya.