Bhagavad Gita 8.24

अग्निर्ज्योतिरह: शुक्ल: शमसा उत्तरायणम् |
तत्र प्रयाता गच्छन्ति ब्रह्म ब्रह्मविदो जना:

Translation

Those Brahmavid devotees who go through the path of six months of Agni, Jyoti, Din, Shuklapaksha and Uttarayan after death, attain Brahma.