Jaiminīya (Talavakāra) Brāhmaṇa 2-8.354.p7

2-8.354.p7

svārājyaṃ vā etā rātrayo yattrayastriṃśatṣoḍaśa parastādahāni ṣoḍaśāvastāt

These nights are independent rule: that which is thirty-three [nights has] sixteen days before and sixteen behind;