Valmiki Ramayana Ayodhya Kanda Sarga 46 Shloka 9

नरव्याघ्र O best of men, माम् me, अनुव्रजता while accompanying, त्वया by you, कार्यम् good deed, कृतम् has been done, वैदेह्याः Sita, रक्षणार्थे for protection, सहायता assistance, अन्वेष्टव्या हि to be sought for.

You, O Lakshmana, the best among men, have done a good job by accompanying me. Otherwise assistance for Sita's protection would have been sought (necessary).