Valmiki Ramayana Ayodhya Kanda Sarga 33 Shloka 30

ऐक्ष्वाकसुतः son of the Ikshvaku race, महात्मा great intellectual, महात्मा highly courageous, रामः Rama, तत् पूर्वम् for the first time, वनम् to the forest, गमिष्यन् while departing, तदा then, आर्तरूपम् sad appearance, सुमन्त्रम् Sumantra, प्रेक्ष्य having seen, पितुः to father, प्रतिहारणार्थम् to inform, व्यतिष्ठत stood.

Seeing Sumantra stricken with grief for the first time the magnanimous Rama, scion of the Ikshvaku dynasty, on the way to the forest waited there for his father to be informed of his arrival.