Vinaya Pitaka - Monastic Rules
Bhikkhu Vibhanga - Sekhiya 72: Not to teach the dhamma to someone who walks on a footpath while one is walking to the side of the footpath unless he is ill.
- Translated from the Pali by I.B. Horner.
… in Anāthapiṇḍika’s monastery. Now at that time the group of six monks, going at the side of a path, taught dhamma to (someone) going along the path … " …
‘I will not teach dhamma, going at the side of a path, to (someone) going along the path (and) who is not ill,’ is a training to be observed."
Dhamma should not be taught, going at the side of a path … if he is the first wrong-doer.
1 tena samayena buddho bhagavā sāvatthiyaṃ viharati jetavane anāthapiṇḍikassa ārāme. tena kho pana samayena chabbaggiyā bhikkhū uppathena gacchantā pathena gacchantassa dhammaṃ desenti … pe … .
2 "na uppathena gacchanto pathena gacchantassa agilānassa dhammaṃ desessāmīti sikkhā karaṇīyā"ti. (72:217)
3 na uppathena gacchantena pathena gacchantassa agilānassa dhammo desetabbo. yo anādariyaṃ paṭicca uppathena gacchanto pathena gacchantassa agilānassa dhammaṃ deseti, āpatti dukkaṭassa.