Valmiki Ramayana 1.55.7

ते स अश्व रथ पादाता वसिष्ठेन महात्मना ।भस्मी कृता मुहूर्तेन विश्वामित्र सुताः तदा॥

te sa aśva ratha pādātā vasiṣṭhena mahātmanā |bhasmī kṛtā muhūrtena viśvāmitra sutāḥ tadā ||

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