Canto 1 - Boyhood
Bāla-kāṇḍa
Chapter 26: The Killing of the Demoness Tāṭakā
Text 1.26.25

वध्यतां तावदेवैषा पुरा सन्ध्या प्रवर्तते।
रक्षांसि सन्ध्याकालेषु दुर्धर्षाणि भवन्ति वै॥

vadhyatāṁ tāvad evaiṣā purā sandhyā pravartate
rakṣāṁsi
sandhyā-kāleṣu durdharṣāṇi bhavanti vai

vadhyatām tāvat eva= kill; eṣā = her; purā = before; sandhyā pravartate = dusk sets in; rakṣāṁsi = for rākṣasas; sandhyā-kāleṣu = at dusk; durdharṣāṇi = unassailable; bhavanti vai = become.

Kill her before dusk sets in, for rākṣasas become unassailable at dusk.