Liturgy על במדבר 31:5

Your teeth are like a counted flock which have come up from the washing; all of which are perfect and none are blemished among them.⁴⁶This is said in reference to the 12,000 men who fought against Midian [Numbers 31:5]; not one of them was ‘blemished’ even with suspicion of lewdness. So chaste were they that they brought offerings of atonement even for evil thoughts they might have had.— Rashi