What is the way for the wife to accept her husband marrying a second wife, especially with her fear of disobeying Allah and falling short in fulfilling her husband's rights if he marries another?

The wife is advised to seek Allah's help and supplicate Him frequently, and to reflect on the consequences and harms of jealousy, which can lead to oppressing the husband or divorce, especially since her husband is righteous and treats her well. This is a blessing that deserves gratitude and preservation.

The husband, if he needs to marry, is advised to be just among his wives and treat them kindly. If he does not need to marry, he is advised not to marry, in order to preserve his wife's affection and comfort her heart.