Valmiki Ramayana Ayodhya Kanda Sarga 61 Shloka 23
Original Shlokaनैतस्य सहिता लोका भयं कुर्युर्महामृथे। अधर्मंत्विह धर्मात्मा लोकं धर्मेण योजयेत्।।2.61.23।।
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महामृथे in the great war, लोकाः worlds, सहिताः united, एतस्य for him, भयम् fear, न कुर्युः will not create, धर्मात्मा virtuous, अधर्मम् unrighteous, लोकम् world, धर्मेण with righteousness, योजयेत् will confer.
Even if all the worlds were to unite and fight against him, he will not fear. This righteous Rama will reestablish justice in this unrighteous world.