Take every thought captive! Have you ever had a bad thought and received immediate discipline for having it? I was grilling some steaks, and was annoyed at a few things going on around me, and a thought passed through my head that I shouldn’t have had. Just as soon as I had the thought, I grabbed the top of the grill cover, instead of the handle, and burned my hand! It was very painful, but as soon as it happened, I knew why. The thought was unloving. When you are set apart by God, which we who are redeemed are, his standard for you is set higher, so all of your actions, and thoughts are closely monitored by him.
The Levites were set apart as a holy priesthood, and were set up to camp around the tabernacle as guards. They didn’t have to go to war, but were to protect God’s holy sanctuary. His standard for them was set higher. When two of Aarons sons introduced strange fire before God, they were killed immediately. Thankfully, I merely received a slap on the hand for introducing such a thought into my temple, which houses the Holy Spirit. Mind your thoughts, and actions because your body is a temple.
Or do you not know that your body is a temple of the Holy Spirit within you, whom you have from God? You are not your own, for you were bought with a price. So glorify God in your body. 1 Corinthians 6:19