Buddhist Dictionary of Pali Proper Names by G P Malalasekera
antevāsī sutta
Antevāsī Sutta:A monk dwells at ease without a pupil or a teacher, the pupil or co-resident (antevāsī) being the name given to evil and unprofitable states of mind which arise in him and abide in him through the senses. Such states are also called ";teacher"; (ācariya) because they beset and master him. S.iv.136-8.