Valmiki Ramayana Aranya Kanda Sarga 49 Shloka 40
Original Shlokaनैष वारयितुं शक्यस्तव क्रूरो निशाचरः।।3.49.40।। सत्त्वाञ्जितकाशी च सायुधश्चैव दुर्मतिः।
1 source checked for this shloka
क्रूरः cruel, सत्त्वान् strong, जितकाशी victorious, सायुधश्चैव wielding weapons, दुर्मतिः evilminded, एषः this, निशाचरः nightranger, तव you, वारयितुम् to prevent, न शक्यः not possible.
This nightranger is equipped with weapons. Cruel, strong and evilminded, he has won wars. You cannot stop him.