As priests of the Lord (see 1 Pet. 2:5; Rev. 1:6) we are to pronounce the sinner as unclean. How can we do that without appearing judgmental? Simply by doing what Jesus did and pointing to the Ten Commandments (see Mark 10:17–22). Consider how Paul did this in Rom. 2:21–23: “You, therefore, who teach another, do you not teach yourself? You who preach that a man should not steal, do you steal? You who say, ‘Do not commit adultery,’ do you commit adultery? You who abhor idols, do you rob temples? You who make your boast in the law, do you dishonor God through breaking the law?” Notice that he asks questions of his hearers. Do the same. Ask, “Have you ever told a lie? Have you ever stolen something, used God’s name in vain (etc.)?”
Leviticus 13:9 “When the leprous sore is on a person, then he shall be brought to the priest.10 And the priest shall examine him; and indeed if the swelling on the skin is white, and it has turned the hair white, and there is a spot of raw flesh in the swelling,11 it is an old leprosy on the skin of his body. The priest shall pronounce him unclean, and shall not isolate him, for he is unclean.12 “And if leprosy breaks out all over the skin, and the leprosy covers all the skin of the one who has the sore, from his head to his foot, wherever the priest looks,13 then the priest shall consider; and indeed if the leprosy has covered all his body, he shall pronounce him clean who has the sore. It has all turned white. He is clean.14 But when raw flesh appears on him, he shall be unclean.15 And the priest shall examine the raw flesh and pronounce him to be unclean; for the raw flesh is unclean. It is leprosy.