The first sin that leads to all other sin is the sin of Pride. It is the root of ALL other sin. It is the most impossible sin to root from our lives due to our fallen nature.
Those who afflicted with a great deal of pride, look at others as inferior in an arrogant way and see themselves as superior to all others.
Pride goes before destruction, and a haughty spirit before a fall. Prov. 16:18
The fear of the Lord is hatred of evil. Pride and arrogance and the way of evil and perverted speech I hate. Prov 8:13
God opposes the proud but gives grace to the humble. James 4:6