Is it permissible to provide financial assistance to a relative to marry another woman, knowing that he divorced his first wife, wronged her, and slandered her honor? And would refraining from assisting him lead him to reconcile with his first wife, which would be preferable?

It is permissible to assist a man financially to get married, as this is not aiding in sin or injustice; rather, it is aiding in righteousness. If the man has wronged his first wife, he must be forbidden from that injustice and commanded to give her her rights. There is no objection to advising him against marrying another, and that he should reconcile with his divorced wife to raise their children under the care of both parents.