Valmiki Ramayana 2.5.4

उपवासयितुं रामं मन्त्रवन्मन्त्रकोविदः ।ब्राह्मं रथवरं युक्तमास्थाय सुदृधव्रतः॥

upavāsayituṃ rāmaṃ mantravanmantrakovidaḥ |brāhmaṃ rathavaraṃ yuktamāsthāya sudṛdhavrataḥ ||

Our plain-language meaning of this verse is waiting for scholar review.