Often times, we look at this question from the New Testament story in Mark 3: 28-30 where Jesus said blasphemy against the Holy Spirit would not be forgiven.

Similarly though, there’s a story in the Old Testament where God refused to forgive. 2 Kings 24:4 says: “who had filled Jerusalem with innocent blood. The Lord would not forgive this”.

Why would the Lord not forgive his people? Is it only because they had filled Jerusalem with innocent blood?

But the story’s context reveals much more than that: “During Jehoiakim’s reign, King Nebuchadnezzar of Babylon invaded the land of Judah. Jehoiakim surrendered and paid him tribute for three years but then rebelled.
Then the Lord sent bands of Babylonian, Aramean, Moabite, and Ammonite raiders against Judah to destroy it, just as the Lord had promised through his prophets.
These disasters happened to Judah because of the Lord’s command. He had decided to banish Judah from his presence because of the many sins of Manasseh, who had filled Jerusalem with innocent blood. The Lord would not forgive this

It is clear from the above that:
IT WAS A DISASTER COMMANDED BY GOD, not orchestrated by satan.

Apparently, God refused to forgive his people because the sins were many and the people became continually rebellious.

Meanwhile, often times, rebellion starts with simple disobedience. From there to habitual disobedience, then later the heart is hardened against the Lord and the person rejects God.

Remember, your salvation was ‘faith-procured’ and can only be ‘faith-sustained’. I often say, you are safe and remained SAVED as long as you are in faith.

How much sin will I commit to take me out of faith? The best answer is graciously stay in faith and don’t make disobedience a lifestyle.

Like the story in Mark 3:28-30:“I tell you the truth, all sin and blasphemy can be forgiven, 29 but anyone who blasphemes the Holy Spirit will never be forgiven. This is a sin with eternal consequences.” 30 He told them this because they were saying, “He’s possessed by an evil spirit.”

The blasphemy here is traceable to the last phrase of the paragraph. “He told them this because they were saying, “He’s possessed by an evil spirit”. In essence, they call the Holy Spirit, who works through Jesus evil spirit.

Additionally, in Mark 3: 1-6, we see the phasrisees left the scene where Jesus healed a man in the synagogue with a determined evil mind to plot to kill Jesus.

Then they gathered again later after witnessing Jesus healing the man with the deformed hand in the synagogue and casting out those possessed with demons, they maintained Jesus was possessed by an evil spirit.

Their rebellious conclusion did not come from a one-off thought but from a hardened heart brewed by an embittered and strong-willed rejection of Jesus and what he stands for.

In essence, one may enter an unsafe place beyond God’s forgiveness when the heart is hardened and faith is lost.

Hebrews 6:4-6 says:
For it is impossible to bring back to repentance those who were once enlightened—those who have experienced the good things of heaven and shared in the Holy Spirit, 5 who have tasted the goodness of the word of God and the power of the age to come — 6 and who then turn away from God. It is impossible to bring such people back to repentance; by rejecting the Son of God, they themselves are nailing him to the cross once again and holding him up to public shame.