The Compendium of Caraka 1.8.21

1.8.21

nānṛjuḥ kṣuyānnādyānna śayīta, na vegito 'anyakāryaḥ syāt, na vāyvagnisalilasomārkadvijagurupratimukhaṃ &niṣṭhīvikāvarcomūtrāṇyutsṛjet, na panthānamavamūtrayenna janavati nānnakāle, na japahomādhyayanabalimaṅgalākriyāsu śleṣmasiṅghāṇakaṃ muñcet //

One should not sneeze, eat, or lie down crookedly; one should not engage in other work when impelled by natural urges; one should not emit sputum, feces, or urine facing the wind, fire, water, the moon, the sun, a brāhmaṇa, or a teacher; one should not urinate on a road, nor in a place with people, nor at mealtime; one should not discharge phlegm or nasal mucus during silent prayer, oblations, study, offerings, or auspicious rites.