Valmiki Ramayana Kishkindha Kanda Sarga 14 Shloka 8
Original Shlokaकृताभिज्ञानचिह्नस्त्व मनया गजसाह्वया। लक्ष्मणेन समुत्पाट्य यैषा कण्ठे कृता तव4.14.8।।
1 source checked for this shloka
या that, एषा this, लक्ष्मणेन by Lakshmana, समुत्पाट्य having uprooted, तव your, कण्ठे in the neck, कृता done, अनया by that, गजसाह्वया with the help of Gaja creeper, त्वम् you, कृताभिज्ञानचिह्नः can be easily recognised.
'Lakshmana has uprooted a creeper of gaja, and fastened it on your neck by which you can be easily identified.