سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 3281
The Book of Marriage
Conditions In Marriage
أَخْبَرَنَا عِيسَى بْنُ حَمَّادٍ، قَالَ أَنْبَأَنَا اللَّيْثُ، عَنْ يَزِيدَ بْنِ أَبِي حَبِيبٍ، عَنْ أَبِي الْخَيْرِ، عَنْ عُقْبَةَ بْنِ عَامِرٍ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ إِنَّ أَحَقَّ الشُّرُوطِ أَنْ يُوَفَّى بِهِ مَا اسْتَحْلَلْتُمْ بِهِ الْفُرُوجَ .
It was narrated from 'Utbah bin 'Amir that the Messenger of Allah said: "The conditions that are most deserving of fulfillment, are those by means of which the private parts become allowed to you."
Sunan an-Nasa'i, 3281sahih (Darussalam)