Vinaya Pitaka - Monastic Rules
Bhikkhu Vibhanga - Sekhiya 70: Not to teach the dhamma to someone who is sitting while one is standing unless they are ill.
- Translated from the Pali by I.B. Horner.
… in Anāthapiṇḍika’s monastery. Now at that time the group of six monks, standing, taught dhamma to (someone) who was sitting down … " …
‘I will not teach dhamma, standing, to (someone) who is sitting down (and) who is not ill,’ is a training to be observed."
Dhamma should not be taught, standing, to (someone) who is sitting down (and) who is not ill … see Ch. 69 … if he is the first wrong-doer.
1 tena samayena buddho bhagavā sāvatthiyaṃ viharati jetavane anāthapiṇḍikassa ārāme. tena kho pana samayena chabbaggiyā bhikkhū ṭhitā nisinnassa dhammaṃ desenti … pe … .
2 "na ṭhito nisinnassa agilānassa dhammaṃ desessāmīti sikkhā karaṇīyā"ti. (70:215)
3 na ṭhitena nisinnassa agilānassa dhammo desetabbo. yo anādariyaṃ paṭicca ṭhito nisinnassa agilānassa dhammaṃ deseti, āpatti dukkaṭassa.