Kurmapurana 1.5.9

Kūrmapurāṇa 1.5.9

triśatī dviśatī sandhyā tathā caikaśatī kramāt /
aṃśakaṃ ṣaṭśataṃ tasmāt kṛsandhyāṃśakaṃ vinā //