...”Any mortal sin can ‘lead to death’ if forgiveness is not sought and received”....
Any command by God that is not obeyed ‘perfectly ‘ would be defined as sin. ...“ALL” unrighteousness is sin” ....(I Jn. 5:17)...................Rom 3:10 “There is none righteous, no, not one.”
And ALL sin leads to death for “the wages of sin IS death”.
As for forgiveness..
God warmly gives His invitation........”Come now, let us ‘reason together’,” says the LORD.’’’’ “Though your sins are like scarlet, ‘’’they shall be as white as snow;’’’’ though they are red as crimson, ....they shall be like wool...Isaih 1:18