V.47-59 Leprosy could also be in the clothing (the garment). Sin can be in the circumstances around us. If only a spot appeared, the garment was to be washed. What a wonderful thing it is when a believer keeps himself unspotted from the world (James 1:2727Pure religion and undefiled before God and the Father is this, To visit the fatherless and widows in their affliction, and to keep himself unspotted from the world. (James 1:27)). While we believers are at work or school we become spotted by contact with the world. If we only hear the things, but do not get involved with them, it is like the spot in verse 58. But note how many times it was to be washed.
All these 59 verses should impress on us the importance, in God’s sight, of keeping ourselves clean. The leprosy in the head (vvs. 29-37) can be a picture of the sin of thinking our own thoughts (2 Cor. 10:5-6).