The Book on Marriage

"Azl was mentined before the Messenger of Allah and he said: 'Why would one of you do that?'"

He (Abu Qilabah) said: "If I wish, I could say: 'The Messenger of Allah said'" but he said: "The Sunnah when a man married a virgin after he already has a wife, is that he stays with her seven (nights). And when he married a matron when he already has a wife, he stays with her three (nights)."

The Prophet would divide (his time) equally between his wives and said: "O Allah! This is my division in what I have control over, so do not punish me for what You have control over which I do not have control over."

The Messenger of Allah said: "When a man has two wives and he is not just between them, he will come on the Day of Judgment with one side drooping."

"The Messenger of Allah returned his daughter Zainab to Abul-As bin Ar-Rabi with a new dowry and a new wedding."

"The Prophet returned his daughter Zainab to Abul-As bin Ar-Rabi after six years in the first marriage without renewing the marriage."

"A man became a Muslim during the time of the Prophet, then his wife became a Muslim, so he said: 'O Messenger of Allah! She accepted Islam along with me, so return her to me.' So he returned her to him."

Ibn Mas'ud was asked about a man who married a woman and he did not stipulate the dowry for her, and he did not enter into her until he died. So Ibn Mas'ud said: "She gets the same dowry as other women, no less and no more, she has to observe the Iddah, and she gets inheritance." So Ma'qil bin Sinan Al-Ashja'I stood and said: "The Messenger of Allah judged the same as you have judged regarding Birwa bint Washiq, a woman of ours." So Ibn Mas'ud was happy about that.