When my kids were toddlers, they would play outside in our sodden English garden and quickly become covered in mud and dirt. For their good and the good of my floor, I’d remove their clothes at the door and wrap them in towels before sticking them in the bath. They’d soon move from dirty to clean with the addition of soap, water, and hugs.

In a vision given to Zechariah, we see Joshua, a high priest, covered in rags that represent sin and wrongdoing (Zech. 3:3). But the Lord makes him clean, removing his filthy clothes and covering him in rich…