One of the things that Allaah has enjoined in His Book is fair treatment of co-wives. Allaah says (interpretation of the meaning):
“You will never be able to do perfect justice between wives even if it is your ardent desire, so do not incline too much to one of them (by giving her more of your time and provision) so as to leave the other hanging (i.e., neither divorced nor married). And if you do justice, and do all that is right and fear Allaah by keeping away from all that is wrong, then Allaah is Ever Oft-Forgiving, Most Merciful.” [al-Nisaa’ 4:129]
The justice that is required here is a fair division of nights, and the giving of each wife her rights as regards spending and clothing. This does not refer to emotions or love, because man has no control over his feelings. But some people, when they marry more than one wife, favour one and neglect the other, spending more time with one wife and spending more on her, and ignoring the other. This is haraam, and the person who does this will come on the Day of Resurrection in the condition described by the Prophet (peace and blessings of Allaah be upon him) in the hadeeth narrated by Abu Hurayrah: “Whoever has two wives and gives one of them preferential treatment, he will come on the Day of Resurrection with half of his body leaning.” (Narrated by Abu Dawud, 2/601; see also Saheeh al-Jaami’, 6491).
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Muharamat - Prohibitions That Are Taken Too Lightly. Islamic book
SpiritualMuharamat - Prohibitions that are taken too lightly English Translation Book by : Sheikh Muhammed Salih Al-Munajjid