Astanga Hrudaya
तत्पूर्वदर्शने दूता व्याहरन्ति मरिष्यताम् । तथार्धरात्रे मध्याह्ने सन्ध्ययोः पर्ववासरे ॥ ११ ॥
such persons appearing before the physician are surely messengers of patients who are about to die. The same applies to a messenger who approaches the physician at midnight, midday, during the twin twilights (sunrise and sunset), or on a Parva day (full moon or new moon days);
english translation
tatpUrvadarzane dUtA vyAharanti mariSyatAm । tathArdharAtre madhyAhne sandhyayoH parvavAsare ॥ 11 ॥
hk transliteration by Sanscript