Valmiki Ramayana Yuddha Kanda Sarga 34 Shloka 21

मनुजेन्द्राय ruler of people, अभिसत्कृत्य extending good hospitality, मैधिली Mythili, दीयताम् given back, जनस्थाने at Janasthana, यत् that, अद्भुतम् amazing, ते to you, पर्याप्तम् sufficient, निदर्शनम् proof.

"Let Mythili be given back to the ruler of the people (Rama) offering good hospitality. The (killing of fourteen thousand Rakshasas) amazing performance at Janasthana by Rama should serve as sufficient proof to you (of the consequences)."