Beloved, do not grumble against one another, so that you may not be judged. See, the Judge is standing at the doors!
Above all, my beloved, do not swear, either by heaven or by earth or by any other oath, but let your “Yes” be yes and your “No” be no, so that you may not fall under condemnation.
James would argue, and I believe Paul supports that if we consider every part of Paul’s writings, that it’s not enough to believe, to simply have faith in Christ to avoid condemnation. Faith apart from works certainly involves receiving forgiveness of sins and eternal life. But James points out that this faith which receives is also to be a faith which gives in response to God and God’s gift and favor given to us. Otherwise there is no true saving faith at all, and one is left condemned because of their commissions and omissions in failing to love God and love one’s neighbor as themselves. But in our glorious Lord Jesus Christ (note James 2:1; NRSV) we are called to a faith that not only rests in God’s promise in Jesus, but is also active in pursuing together God’s call for us in Christ.