MN 4

tassa mayhaṃ brāhmaṇa, etadahosi, ye kho keci samaṇā vā brāhmaṇā vā aparisuddhakāyakamm'antā araññavanapatthāni pantāni sen'āsanāni paṭisevanti, aparisuddha-kāyakamm'anta-sandosahetu have te bhonto samaṇabrāhmaṇā akusalaṃ bhayabheravaṃ avhāyanti.