James 5:20---Who Does the Second "His" Refer to?

According to the D-R, James 5:20: > He must know that he who causeth a sinner to be converted from the error of his way, shall save his soul from death, and shall cover a multitude of sins. QUESTION: Who does the second "his" refer to here (the converted sinner or the converter)? Is anyone familiar with the underlying Greek that may be able to answer this question? Thank you.