Majjhima Nikaya (Coleção dos Discursos Médios) 5:62
SUJATOAnekapariyāyena hi no, bhante, antarāyikā dhammā antarāyikā vuttā bhagavatā;
For in many ways the Buddha has told us that obstructive acts are obstructive, and that they really do obstruct the one who performs them.