Canto 3 -
Araṇya-kāṇḍa
Chapter 11: Rāma Goes to Agastya’s Āśrama
Text 3.11.16

तत्र कर्तुं तपोविघ्नं देवैः सर्वैर्नियोजिताः।
प्रधानाप्सरसः पञ्च विद्युच्चलितवर्चसः॥

tatra kartuṁ tapo-vighnaṁ devaiḥ sarvair niyojitāḥ
pradhānāpsarasaḥ pañca vidyuc-calita-varcasaḥ

tatra kartum tapaḥ-vighnam = to destroy his austerities; devaiḥ = the devas; sarvaiḥ = all; niyojitāḥ = engaged; pradhāna-apsarasaḥ = chief apsarās; pañca = five; vidyut-calita-varcasaḥ = whose effulgence glittered like lightning.

To destroy his austerities, all the devas engaged five chief apsarās whose effulgence glittered like lightning.