“Whoever commits sin also commits lawlessness, and sin is lawlessness.”
1 John 3:4
To the pure all things are pure, but to those who are defiled and unbelieving nothing is pure; but even their mind and conscience are defiled.
Titus 1:15
If anyone, then, knows the good they ought to do and doesn’t do it, it is sin for them.
James 4: 17-21