Mahabharata 3.113.2

3.113.2

surūparūpāṇi ca tāni tāta pralobhayante vividhairupāyaiḥ |
sukhācca lokācca nipātayanti tānyugrakarmāṇi munīnvaneṣu || 2 ||

"Vibhandaka said, 'Those are, O son! Rakshasas. They walk about in that wonderfully beautiful form. Their strength is unrivalled and their beauty great And they always meditate obstruction to the practice of penances. And, O my boy, they assume lovely forms and try to allure by diverse means. And those fierce beings hurled the saints, the dwellers of the woods, from blessed regions (won by their pious deeds) And the saint who hath control over his soul, and who is desirous of obtaining the regions where go the righteous, ought to have nothing to do with them. And their acts are vile and their delight is in causing obstruction to those who practise penance; (therefore) a pious man should never look at them.