In 4:3, it says per the Sahih International translation:
And if you fear that you will not deal justly with the orphan girls, then marry those that please you of [other] women, two or three or four. But if you fear that you will not be just, then [marry only] one or those your right hand possesses. That is more suitable that you may not incline [to injustice].
This can easily be understood as a reminder to men who want to marry multiple wives that they have to treat their wives equitably. However, if there is no way for the wives to enforce this, it can easily fall flat. This leads to the questions:
- What constitutes "injustice" among multiple wives? Please make sure to elaborate on general, yet specific enough rules, not just concrete example situations.
- What can a wife who feels she is being treated unjustly compared to her co-wives do to force her husband to correct this? Is it grounds for obtaining a divorce, can she legally force him to change his behavior while staying in the marriage, is there payment she can demand; what legal rights does being treated unjustly by her husband give her?