Hence, one should never study the Veda with rapt altention at forbidden times. They who answer a call of nature, with face towards the sun or towards a burning fire, or towards a cow, or towards a twice born person, or on the road, become shortlived. At day time both calls of nature should be answered with face turned towards the north.
तस्माद् युक्तो ह्यनध्याये नाधीयीत कदाचन॥ प्रत्यादित्यं प्रत्यनलं प्रति गां च प्रति द्विजान्। ये मेहन्ति च पन्थानं ते भवन्ति गतायुषः॥ उभे मूत्रपुरीषे तु दिवा कुर्यादुदङ्मुखः।