Valmiki Ramayana 7.4.21
अवश्यमेव दातव्या परस्मै सेति सन्ध्यया ।चिन्तयित्वा सुता दत्ता विद्युत्केशाय राघव॥
avaśyameva dātavyā parasmai seti sandhyayā |cintayitvā sutā dattā vidyutkeśāya rāghava ||
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book