The Duties of the House Holder^ Rules of Good Conduct - Verse 61

(One shall not touch) the hairs on the private parts; one should not travel in the company of an uncultured fellow; one should not (warm) hands and feet in the fire, one should not indulge in unsteady act of the penis, belly and ears. One should not scratch oneself with nails. One should not drink water with palms joined together.