Valmiki Ramayana Kishkindha Kanda Sarga 18 Shloka 25
Original Shlokaवयं तु भरतादेश विधिं कृत्वा हरीश्वर। त्वद्विधान्भिन्नमर्यादान्नियन्तुपर्यवस्थिताः4.18.25।।
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हरीश्वर lord of monkeys, वयं तु we too, भरतादेशम् by Bharata's command, विधिम् following his command, कृत्वा do, भिन्नमर्यादान् deviated from the bounds of dharma, त्वद्विधान् this way, नियन्तुम् to punish, पर्यवस्थिताः determined.
'O Vali we have to follow Bharata's command and are bent upon punishing those wicked people who deviate from the bounds of dharma.