Ishaq bin Yusuf bin Mrdas إسحاق بن يوسف بن مرداس · Marriage (Kitab Al-Nikah)

‘Uqbah bin ‘Amir reported the Apostle of Allaah (ﷺ) as saying “The condition worthier to be fulfilled by you is the one by which you made the private parts (of your wife) lawful (for you).