Matthew 10:28, 32-33, 39

And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell.

Whosoever therefore shall confess me before men, him will I confess also before my Father which is in heaven. But whosoever shall deny me before men, him will I also deny before my Father which is in heaven.

He that findeth his life shall lose it: and he that loseth his life for my sake shall find it.