عَنْ عُقْبَةَ بْنِ عَامِرٍ رَضِيَ اللَّهُ عَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ إِنَّ أَحَقَّ الشُّرُوطِ أَنْ يُوفَى بِهِ مَا اسْتَحْلَلْتُمْ بِهِ الْفُرُوجَ
Narrated by Sayyiduna Uqbah bin Amir (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: The conditions which deserve to be fulfilled the most are those by which you make private parts lawful (i.e., marriage contracts).