Valmiki Ramayana Ayodhya Kanda Sarga 28 Shloka 16

बाले O innocent one, स्वयम् on your own, आहृतैः has been brought, कुसुमैः with flowers, आर्षेण विधिना as per the injunction of the Vedas, वेद्याम् on the altar, उपहारश्च offering, कर्तव्यः needs to be made, अतः therefore, वनम् living in the forest, दुःखम् is difficult.

Flowers collected with one's own hands, O innocent one, should be offered on the altar as per injunction of the Vedas. Therefore (life in the) forest is difficult.