Regarding two sins I am serious to myself that leads to eternal condemnation.
1. Mark 3:28
"whoever blasphemes against the Holy Spirit does not have forgiveness forever, but is guilty of
an eternal sin.."
2. 1 Corinthians 6:18-19
"Flee sexual immorality. Every sin that a person commits is outside his body, but
the one who commits sexual immorality sins against his own body.
Or do you not know that your body is the temple of the Holy Spirit
who is in you, whom you have from God, and
you are not your own?".
1 Corinthians 3:16-17
"Do you not know that you are God’s temple and the Spirit of God dwells in you?
If anyone destroys God’s temple, God will destroy this one. For God’s temple is holy, which you are".
1 Thessalonians 4:3-5
For this is the will of God, your sanctification: that you abstain from sexual immorality;
that each of you
know how to possess his own vessel in sanctification and honor, not in lustful passion, just as also the Gentiles who do not know God..."
Hebrews 10:26-29
For if we keep on sinning deliberately after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, but a certain fearful expectation of judgment and a fury of fire that is about to consume the adversaries. Anyone who rejected the law of Moses dies without mercy on
the testimony of two or three witnesses. How
much worse punishment do you think the person will be considered worthy of who treats with disdain the Son of God and who considers ordinary the blood of the covenant by which he was made holy and who insults the Spirit of grace?
But, when Peter showed partiality for jews, it was corrected by Paul, which is not a serious sin, but Peter with humility accepted the correction from Paul, who is younger to him.