Some have argued that James contradicts Paul at this point, saying that Abraham and Rahab, for example, were "justified by works" (James 2:21,25). However, they were not justified by the "works of the law." Abraham lived before God gave the Mosaic law, and Rahab lived in a culture that had not heard of it. As a matter of fact, they were justified by faith in the eyes of God (James 2:23; Hebrews 11:31) and justified by works in the eyes of men (James 2:18). There is no contradiction, for genuine saving faith is inevitably demonstrated before men by "works of righteousness" (Titus 3:5; Ephesians 2:8-10). In any case, Paul makes it clear to the Galatians, and to us, that no one can ever be justified by keeping the law; James himself makes it plain that no one can keep the law fully (James 2:10).

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8