2 Maccabees 5:6

6 But Jason kept relentlessly slaughtering his fellow citizens, not realizing that success at the cost of one's kindred is the greatest misfortune, but imagining that he was setting up trophies of victory over enemies and not over fellow countrymen.

2 Maccabees 5:6 In-Context

4 Therefore all men prayed that the apparition might prove to have been a good omen.
5 When a false rumor arose that Antiochus was dead, Jason took no less than a thousand men and suddenly made an assault upon the city. When the troops upon the wall had been forced back and at last the city was being taken, Menelaus took refuge in the citadel.
6 But Jason kept relentlessly slaughtering his fellow citizens, not realizing that success at the cost of one's kindred is the greatest misfortune, but imagining that he was setting up trophies of victory over enemies and not over fellow countrymen.
7 He did not gain control of the government, however; and in the end got only disgrace from his conspiracy, and fled again into the country of the Ammonites.
8 Finally he met a miserable end. Accused before Aretas the ruler of the Arabs, fleeing from city to city, pursued by all men, hated as a rebel against the laws, and abhorred as the executioner of his country and his fellow citizens, he was cast ashore in Egypt;
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.