According to Moses, if the priest looks at a sore on someone's skin and it looks deeper than the skin around it and the hair has turned white, then the priest will say the person is not clean because it's a sign of a serious skin disease. This helps everyone stay healthy by keeping away from sickness.
Leviticus 13:20: And if, when the priest seeth it, behold, it [be] in sight lower than the skin, and the hair thereof be turned white; the priest shall pronounce him unclean: it [is] a plague of leprosy broken out of the boil.
Contradicts the detailed judgment process in Leviticus 13:20 by advising against judging others.
Matthew 7:1: Judge not, that ye be not judged.
While Leviticus 13:20 focuses on physical appearances for judgment, John 7:24 emphasizes judging with righteous judgment beyond appearances.
John 7:24: Judge not according to the appearance, but judge righteous judgment.