The men of Midian used their wives to seduce the Israelites. In the dual Torah readings מטות Matot and מסעי Massei, we learn that Midian did this under the belief that they had to conquer Israel for their own long-term survival, for the sake of their sons.
At some point in our lives, we have all unintentionally “murdered” someone in our hearts. If you hate someone, you are guilty. We should repent, but we still have to deal with that murder guilt. That guilt was paid by the High Priest, our High Priest is Yeshua. It is only the death of Yeshua that pays for that sin.