Larger Catechism
Q 84. Shall all men die?
A. Death being threatened as the wages of sin,1 it is appointed unto all men once to die;2 for that all have sinned.3
Romans 6:23
For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord. (ESV)
Hebrews 9:27
And just as it is appointed for man to die once, and after that comes judgment, (ESV)
Romans 5:12
Therefore, just as sin came into the world through one man, and death through sin, and so death spread to all men because all sinned— (ESV)