Mahapadanasutta 3.23.9

3.23.9

Api ca, bhante, mayaṃ tathā karissāma yathā bhikkhū channaṃ channaṃ vassānaṃ accayena bandhumatiṃ rājadhāniṃ upasaṅkamissanti pātimokkhuddesāyā’ti.

And sir, I’ll make sure that when six years have passed the mendicants will return to Bandhumatī to recite the monastic code.’