Luke 22:50
"And one of them smote the servant of the high priest, and cut off his right ear."
Cross References (ranked by relevance)
Mark 14:47
And one of them that stood by drew a sword, and smote a servant of the high priest, and cut off his ear.
2 Corinthians 10:4
(For the weapons of our warfare are not carnal, but mighty through God to the pulling down of strong holds;)
Romans 12:19
Dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, saith the Lord.