Abu Bakr b. ‘Abd ar-Rahman told that when God’s Messenger married Umm Salama he said to her in the morning, “You are not being humbled in my estimation. If you wish I shall stay with you seven nights as I did with my other wives, but if you wish I shall stay three and then visit my wives in turn.” She replied, “Stay three nights.” In a version he said, “The virgin gets seven nights and the woman who has had a previous husband three.”
It pertains to the sunna that when a man who has a wife marries a virgin he should stay with her for seven nights and then divide the time between them, but if he marries a woman who has been previously married he should stay with her three nights and then divide his time between his wives. Abu (Qilaba remarked that if he wished he could say that Anas traced it to the Prophet.
‘A’isha told that the Prophet used to divide his time among his wives equally and say, “O God, this is my division concerning what I possess, so do not blame me concerning what Thou possessest and I do not.”
Tirmidhi, Abu Dawud, Nasa’i, Ibn Majah and Darimi transmitted it.
