Leviticus 13: 1-2. 44-46
Once a priest has diagnosed a person with leprosy, that person is resigned as unclean and must live apart from the community. 

1 Corinthians 10: 31-11:1
Think about others, imitate Christ and glorify God in all that you do. 

Mark 1: 40-45
Jesus touches and cures a leper – regarded as an unclean person – and so doing breaks a serious religious taboo.