Bhagwad Gita
Chapter 8, Verse 25
धूमो रात्रिस्तथा कृष्णः षण्मासा दक्षिणायनम्।
तत्र चान्द्रमसं ज्योतिर्योगी प्राप्य निवर्तते।।8.25।।
The mystic who passes away from this world during the smoke, the night, the moonlight fortnight, or in the six months when the sun passes to the south, or who reaches the moon planet, again comes back.