Adbhutasagara 48.280

48.280

viṣṇudharmottare|
jale na paśyecca mukhaṃ nirmale darpaṇe tathā|
paśyenna puruṣaścāyāṃ sadyo maraṇamādiśet||

In the Viṣṇudharmottara:
If a man cannot see his face in water, nor in a clean mirror,
or if he does not see his shadow, one should predict immediate death.