blemish

Facts

The term "blemish" refers to a defect or imperfection in an animal. It also refers figuratively to spiritual imperfections and faults in people

The Israelites were instructed by God to offer an unblemished animal for certain sacrifices. This animal had no physical defects.
This is a picture of how Jesus Christ was the perfect sacrifice, without any sin.
Believers in Christ have been cleansed from their sin by his blood and are considered to be without blemish.
Ways to translate this term could include, "defect" or "imperfection" or "sin," depending on the context.