Sulayman ibn Yasar related from Ibn Abbas, may Allah be pleased with him and his father, concerning this verse: If she reaches a settlement with him by relinquishing some of her rights to an equitable share of his time and to maintenance, this is permissible as long as she consents. But if, after the settlement, she withdraws from it, she may do so, and her full rights are hers. (1)
Muqatil ibn Hayyan said concerning this verse: A man may have an elderly wife and then marry a younger woman in addition to her. He says to the older wife, “I have given you [from] (2) my wealth a share, on condition that I allocate more time to this younger woman than I allocate to you.” If she is content with the arrangement they have agreed upon, then so be it; but if she refuses to accept it, he must treat them equitably in the division of time.
It is related from Ali, may Allah be pleased with him, concerning this verse: A woman may be married to a man, but his eye turns away from her because of her unattractiveness or old age, while she dislikes being separated from him. If she gives him some of her wealth, it is lawful for him; and if she gives him some of her allotted days, it is lawful for him. (3) “Settlement is best,” meaning: her remaining with him after he has given her the choice. Reaching a settlement by relinquishing some of her rights to an equitable share of time and to maintenance is better than separation.
This is as related of Sawdah, may Allah be pleased with her, who had grown old, and the Prophet, peace and blessings be upon him, wished to separate from her. She said, “Do not divorce me. My only wish is to be raised among your wives, and I have assigned my allotted turn to Aishah, may Allah be pleased with her.” So the Messenger of Allah, peace and blessings be upon him, kept her as his wife, and he allotted to Aishah both her day and Sawdah’s day. (4)
His saying, exalted is He: “Human souls are ever inclined to selfishness,” means the selfishness of each spouse regarding his or her share from the other. Selfishness is the ugliest form of miserliness; its true nature is eagerness to withhold what is good. “If you do good,” that is, if you set matters right, “and are mindful of Allah,” by avoiding injustice. It is also said that this is addressed to husbands: if you act kindly by remaining with her despite your aversion, and fear wronging her, “then Allah is surely All-Aware of what you do,” and He will recompense you for your deeds.
“You will never be able to maintain equal treatment between wives, however keen you may be. So do not let your inclination be so excessive that you leave one of them suspended. But if you reconcile and are mindful of Allah, then surely Allah is All-Forgiving, Most Merciful. (129)”
His saying, exalted is He: “You will never be able to maintain equal treatment between wives,” means: you will never be able to make wives equal in love and the inclination of the heart, “however keen you may be” to be just. “So do not let your inclination be so excessive,” that is, toward the one whom you love, “that you leave one of them suspended.” This refers to excessive preference in the division of time and in maintenance: do not make your actions follow your desires, lest you leave the other like one suspended—neither without a husband nor truly a wife. Qatadah said: like one imprisoned. In the recitation of Ubayy ibn Ka'b: “as though she were imprisoned.”