Valmiki Ramayana Aranya Kanda Sarga 61 Shloka 13

सीताम् Sita, अनासादयमानम् unable to find, दशरथात्मजम् the son of Dasaratha, विपुलम् deep, पङ्कम् mud, आसाद्य reached, सीदन्तम् sinking, कुञ्जरम् इव like an elephant, तं रामम् that Rama, लक्ष्मणः Lakshmana, अत्यर्थम् great, हितकाम्यया for his welfare, उवाच said.

Lakshmana, dedicated to his wellbeing, spoke to Rama, son of Dasaratha, who was sinking like an elephant into the quagmire, when he failed to trace Sita.