Markandeyapurana 39.52

39.52

vighrāya tasya vai doṣā jāyante tannibodha me /
bādhiryaṃ jaḍatā lopaḥ smṛtermūkatvamandhatā //

When it is neither very cold nor warm, when there is no strife, when it is not windy, at these times the ascetic who is deep in meditation should not[13] practice yoga. In a place where there is a noise, or fire, or water, or where study is going on, in a decayed cow-shed, at a place where four roads meet, amid a collection of dry leaves, in a river, in a burning-ground, in a place infested by snakes, in a place of fear, or on the edge of a well, amid a number of funeral piles or ant-hills—in these places a learned man should avoid practising yoga. And if there is no appearance of goodness, he should avoid the place and time. There should be no sight of evil during the practice of yoga; hence he should avoid that. Whoever disregards these places and in his infatuation practises yoga, verily his faults tend to his hindrance. Hearken to me in this. Deafness, stupidity, failure of memory, dumbness, blindness and fever— those several evils straightway befall him who practises yoga in ignorance.