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अग्निर्ज्योतिरहः शुक्लः षण्मासा उत्तरायणम्। तत्र प्रयाता गच्छन्ति ब्रह्म ब्रह्मविदो जनाः।।

agnir jyotir ahaḥ śuklaḥ ṣaṇ-māsā uttarāyaṇam tatra prayātā gacchanti brahma brahma-vido janāḥ

agniḥ (fire) jyotiḥ (light) ahaḥ (day) śuklaḥ (the white fortnight of the moon) ṣaṭ-māsāḥ (six months) uttara-ayaṇam (when the sun passes on the northern side) tatra (there) prayātāḥ (those who pass away) gacchanti (go) brahma (to the Absolute) brahma-vidaḥ (persons who know the Absolute) janāḥ (people)

Those who know the Supreme Brahman attain that Supreme by passing away from the world during the influence of the fiery god, in the light, at an auspicious moment of the day, during the fortnight of the waxing moon, or during the six months when the sun travels in the north.

Kṛṣṇa describes the ‘Path of Light’ (Devayāna). Those who know the Absolute and pass away during the influence of the fire-god, in the light of day, during the waxing moon, and during the six months when the sun travels in the north, reach the Supreme Brahman. These elements—Fire, Light, Day, the Waxing Moon, and the Northern Sun—are symbolic of clarity, growth, and enlightenment. They are presided over by celestial deities who guide the soul upward. This is the auspicious exit for the person who has lived in knowledge and died in a state of wakefulness. This path is for the ‘Brahma-vido’, the knowers of the Spirit. It emphasizes that dying in a state of brightness and consciousness is the goal of the mystical path. Kṛṣṇa is showing the traditional way that sages used to time their departure to ensure they moved toward the Light and away from the cycle of rebirth.