The unforgivable sin, also referred to as the unpardonable sin or “blasphemy of the Holy Spirit” is mentioned in two gospels. Jesus said, "Truly I tell you, people can be forgiven all their sins and every slander they utter" (Mark 3:28), but then He gives one exception: "Whoever blasphemes against the Holy Spirit will never be forgiven; they are guilty of an eternal sin." So what exactly is blasphemy against the Holy Spirit? To understand this difficult saying, we need to see that it came in the context of Jesus’ opponents charging Him with doing His work by the power of the Devil rather than by the power of the Holy Spirit. However, they were not slandering the Spirit – not quite. Their statements were directed against Jesus. He said to them: "You can blaspheme Me and be forgiven, but when you question the work of the Spirit, you are coming perilously close to the unforgivable sin. You are right at the line. You are looking down into the abyss of hell. One more step and there will be no more hope for you." He was warning them to be very careful not to insult or mock the Spirit. So what exactly is the unforgivable sin and can you commit it? Here are five things you need to know.