b) Establish the fact that the penalty of sin is death.

Ezekiel 18:20
Romans 6:23

Ezekiel 18:20

The soul that sinneth, it shall die. The son shall not bear the iniquity of the father, neither shall the father bear the iniquity of the son: the righteousness of the righteous shall be upon him, and the wickedness of the wicked shall be upon him.

Romans 6:23

For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord.