AARONIC priest came with army, spoke peaceably, then he killed them

7. Now then send a man whom you trust; let him go and see all the ruin which Judas has brought upon us and upon the land of the king, and let him punish them and all who help them."
8. So the king chose  Bacchides, one of the king's friends, governor of the province Beyond the River; he was a great man in the kingdom and was faithful to the king.
9. And he sent him, and with him the ungodly Alcimus, whom he made high priest; and he commanded him to take vengeance on the sons of Israel.
10. So they marched away and came with a large force into the land of Judah; and he sent messengers to Judas and his brothers with peaceable but treacherous words.
11. But they paid no attention to their words, for they saw that they had come with a large force.
12. Then a group of scribes appeared in a body before Alcimus and Bacchides to ask for just terms.
13. The Hasideans were first among the sons of Israel to seek peace from them,
14. for they said, "A priest of the line of Aaron has come with the army, and he will not harm us."
15. And he spoke peaceable words to them and swore this oath to them, "We will not seek to injure you or your friends."
16. So they trusted him; but he seized sixty of them and killed them in one day, in accordance with the word which was written,
17. "The flesh of thy saints and their blood
they poured out round about Jerusalem,
and there was none to bury them."
18. Then the fear and dread of them fell upon all the people, for they said, "There is no truth or justice in them, for they have violated the agreement and the oath which they swore."
19. Then Bacchides departed from Jerusalem and encamped in Beth-zaith. And he sent and seized many of the men who had deserted to him, and some of the people, and killed them and threw them into a great pit.