What is God's definition of sin?
If we look in scripture, God says that sin is breaking His law.
"Sin is the transgression of the law." 1 John 3:4.
So what does this mean, what does scripture identify as His law? Is sin breaking God's Ten Commandment law, and since the law of God is perfect (Psalms 19:7), does it need changing? Or do the Commandments cover "the whole duty of man." Ecclesiastes 12:13.
If they cover the whole duty of man, what do they tell us to do. If we look at them carefully we see the Commandments in the first four show love for God, the next six show love for our fellowman. So lets see how Christ explains it:
The Greatest Commandment
34Hearing that Jesus had silenced the Sadducees, the Pharisees got together. 35One of them, an expert in the law, tested him with this question:
36"Teacher, which is the greatest commandment in the Law?" 37Jesus replied: " 'Love the Lord your God with all your heart and with all your soul and with all your mind.'38This is the first and greatest commandment. 39And the second is like it:'Love your neighbor as yourself.'[c] 40All the Law and the Prophets hang on these two commandments."
Thus was Christ covering all 10 when asked about them...