Valmiki Ramayana Ayodhya Kanda Sarga 19 Shloka 27

रामस्य Rama's, वचः words, श्रुत्वा having heard, पिता father, सः that (Dasaratha), भृशम् greatly, दुःखहतः hit with grief, शोकात् out of sorrow, वक्तुम् to speak, अशक्नुवन् was not able, महास्वनम् with a loud voice, प्ररुरोद cried.

Father (Dasaratha), too tormented with grief to speak cried out loudly on hearing the words of Rama.