I Maccabees 5:67

67 At that time certain priests, desirous to shew their valour, were slain in battle, for that they went out to fight unadvisedly.

I Maccabees 5:67 In-Context

65 Afterward went Judas forth with his brethren, and fought against the children of Esau in the land toward the south, where he smote Hebron, and the towns thereof, and pulled down the fortress of it, and burned the towers thereof round about.
66 From thence he removed to go into the land of the Philistines, and passed through Samaria.
67 At that time certain priests, desirous to shew their valour, were slain in battle, for that they went out to fight unadvisedly.
68 So Judas turned to Azotus in the land of the Philistines, and when he had pulled down their altars, and burned their carved images with fire, and spoiled their cities, he returned into the land of Judea.

The Brenton translation of the Septuagint is in the public domain.