Valmiki Ramayana Aranya Kanda Sarga 30 Shloka 12
Original Shlokaनृशंस नीच क्षुद्रात्मन्नित्यं ब्राह्मणकण्टक। यत्कृते शङ्कितैरग्नौ मुनिभिः पात्यते हविः।।3.30.12।।
1 source checked for this shloka
नृशंश cruel , नीच mean, क्षुद्रात्मन् a vile self, नित्यम् always, ब्राह्मणकण्टक opposing the brahmins, यत्कृते due to whom, शङ्कितैः by hesitant, मुनिभिः by seers, हविः an oblation, अग्नौ in fire, पात्यते is offered.
O cruel, mean, vile fellow, you had been always opposing the brahmins who pour oblations in fire under fear.