1 Corinthians 15:14,17
And if Christ has not been raised, then our preaching is in vain and your faith is in vain. And if Christ has not been raised, your faith is futile and you are still in your sins.

My brothers, if anyone among you wanders from the truth and someone brings him back, let him know that whoever brings back a sinner from his wandering will save his soul from death and will cover a multitude of sins.
James 5:19-20