Bhagavad Gita Chapter 8
Powerful Cognition
When one passes in light, symbolic of times when our mind is totally balanced and when we are not agitated, he never comes back.
dhūmo rātristathā kṛṣṇaḥ ṣaṇmāsā dakṣiṇāyanam tatra cāndramasaṃ jyotir yogī prāpya nivartate
The mystic who passes away from this world during the smoke, the night, the moonless fortnight, or the six months when the sun passes to the south, have done good deeds go to the cosmic layer and again comes back.