Charak Samhita

siva.sh/caraka-samhita/sutra-sthana/8/24

न विद्युत्स्वनार्तवीषु नाभ्युदितासु दिक्षु नाग्निसम्प्लवे न भूमिकम्पे न महोत्सवे नोल्कापाते न महाग्रहोपगमने ननष्टचन्द्रायां तिथौ न सन्ध्ययोर्नामुखाद्गुरोर्नावपतितं नातिमात्रं न तान्तं न विस्वरं नानवस्थितपदं नातिद्रुतं न विलम्बितंनातिक्लीबं नात्युच्चैर्नातिनीचैः स्वरैरध्ययनमभ्यस्येत् ||२४||

sanskrit

[Code for learning and studying] -One should not study when there is unseasonal lightning, houses appear as if they are burnt, during outbreak of fire, earthquake, grand festivals, fall of meteors, eclipses (solar or lunar). One should not study on a new moon day, during dawn or dusk. -One should not study without being instructed by preceptor. One should not pronounce words in low, high, weak or deranged voice, without proper accents and morphological symmetry, neither too fast nor too slow, nor with excessive delay and nor with too high or too low pitch of sound.

english translation

na vidyutsvanArtavISu nAbhyuditAsu dikSu nAgnisamplave na bhUmikampe na mahotsave nolkApAte na mahAgrahopagamane nanaSTacandrAyAM tithau na sandhyayornAmukhAdgurornAvapatitaM nAtimAtraM na tAntaM na visvaraM nAnavasthitapadaM nAtidrutaM na vilambitaMnAtiklIbaM nAtyuccairnAtinIcaiH svarairadhyayanamabhyasyet ||24||

hk transliteration

siva.sh/caraka-samhita/sutra-sthana/8/24

न विद्युत्स्वनार्तवीषु नाभ्युदितासु दिक्षु नाग्निसम्प्लवे न भूमिकम्पे न महोत्सवे नोल्कापाते न महाग्रहोपगमने ननष्टचन्द्रायां तिथौ न सन्ध्ययोर्नामुखाद्गुरोर्नावपतितं नातिमात्रं न तान्तं न विस्वरं नानवस्थितपदं नातिद्रुतं न विलम्बितंनातिक्लीबं नात्युच्चैर्नातिनीचैः स्वरैरध्ययनमभ्यस्येत् ||२४||

sanskrit

[Code for learning and studying] -One should not study when there is unseasonal lightning, houses appear as if they are burnt, during outbreak of fire, earthquake, grand festivals, fall of meteors, eclipses (solar or lunar). One should not study on a new moon day, during dawn or dusk. -One should not study without being instructed by preceptor. One should not pronounce words in low, high, weak or deranged voice, without proper accents and morphological symmetry, neither too fast nor too slow, nor with excessive delay and nor with too high or too low pitch of sound.

english translation

na vidyutsvanArtavISu nAbhyuditAsu dikSu nAgnisamplave na bhUmikampe na mahotsave nolkApAte na mahAgrahopagamane nanaSTacandrAyAM tithau na sandhyayornAmukhAdgurornAvapatitaM nAtimAtraM na tAntaM na visvaraM nAnavasthitapadaM nAtidrutaM na vilambitaMnAtiklIbaM nAtyuccairnAtinIcaiH svarairadhyayanamabhyasyet ||24||

hk transliteration