Kurmapurana 1.2.106

Kūrmapurāṇa 1.2.106

tasmāt kāryaṃ triśūlāṅkaṃ tathā ca tilakaṃ śubham /
triyāyuṣaṃ ca bhaktānāṃ trayāṇāṃ vidhipūrvakam //