John Piper stares at James 5:19-20 for 15 minutes trying to avoid what it obviously teaches. Very entertaining.
19 My brethren, if any one among you wanders from the truth and some one brings him back, 20 let him know that whoever brings back a sinner from the error of his way will save his soul from death and will cover a multitude of sins. (James 5:19-20 RSVCE)
It is obvious James does not care about Calvinists much. This verse directly contradicts their perseverance of the saints doctrine.
Links to video and article:
Grab some popcorn and enjoy.