Valmiki Ramayana Aranya Kanda Sarga 45 Shloka 14

बलवताम् of strong people, बलैरपि even with all their strength, सेश्वरैः by Indra, सामरैरपि even by those supported by gods, समुद्युक्तै: by the wellequipped, त्रिभिः लोकै by the three worlds, अपि also, तस्य his, बलम् strength, अनिवार्यम् irresistible.

He cannot be stopped by the strength of the mighty, or by Indra supported by gods or by the wellequipped armies of all the three worlds.