Answer:
The Word of God says, "The wages for sin is death"
So, if sin is how you work, then death should be the check
There can be no forgiveness without the shedding of blood
The penalty must be paid if God is a righteous judge
We say, "Just let it slide", but, if someone killed your cousin
Would you call that judge righteous if his killer goes unpunished?
Or would you call him crooked? And we know the Lord ain't that
So, there's a death penalty, and someone has to pay that
The moment that you sin, your life has been indebted
And His mercy is the only reason He ain't yet collected
So, that's why they would sacrifice lambs in their places
But it didn't clear the debt, it was just a partial payment.