Chapter 8 · The Imperishable Absolute · Krishna said
Bhagavad Gita 8.24 — The path of light
अग्निर्जोतिरहः शुक्लः षण्मासा उत्तरायणम्। तत्र प्रयाता गच्छन्ति ब्रह्म ब्रह्मविदो जनाः ॥
agnirjotirahaḥ śuklaḥ ṣaṇmāsā uttarāyaṇam | tatra prayātā gacchanti brahma brahmavido janāḥ ||
Meaning
Fire, light, day, the bright fortnight, the six months of the sun's northern course — departing by this path, knowers of Brahman go to Brahman.