Hadith 165

Bulugh al-Maram

Book 8: Marriage
Hadith 165
وَفِي لَفْظٍ لِمُسْلِمٍ, قَالَ اَلزُّهْرِيُّ: { وَلَا أَرَى بَأْسًا أَنْ تَزَوَّجَ وَهِيَ فِي دَمِهَا, غَيْرَ أَنَّهُ لَا يَقْرَبُهَا زَوْجُهَا حتَّى تَطْهُرَ 1‏ } .‏
A wording by Muslim has:

az-Zuhri said, "I think there is no harm if she marries when she is still bleeding (due to child-birth), but her husband should not go near her till she is purified."