This verse is quoted in Srila Rupa Gosvami’s Sri Padyavali (151):
ramo nama babhuva hum tad-abala siteti hum tam pitur
vaca pancavati-vane viharatas tasyharad ravanah
nidrartham janaki-katham iti harer hum-karatah srnvatah
saumitre kva dhanur dhanur dhanur iti vyagra girah pantu nah
[Mother Yasoda is telling Sri Krishna a story:]
“There was once a king named Rama.”
“Yes.”
“His wife was Sita.”
“Yes.”
“On the order of His father, Rama lived in the Panchavati Forest. There Ravana kidnapped Sita.”
