It was narrated from 'Amr bin Shu'aib, from his father, that his grandfather said:“The Messenger of Allah said: “Whatever is given as a dowry or gift before the marriage, it belongs to her. Whatever is given after the marriage belongs to the one to whom it was given. And the most deserving matter for which a man is honored is (the marriage of) his daughter or sister.”
حَدَّثَنَا أَبُو كُرَيْبٍ، حَدَّثَنَا أَبُو خَالِدٍ، عَنِ ابْنِ جُرَيْجٍ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " مَا كَانَ مِنْ صَدَاقٍ أَوْ حِبَاءٍ أَوْ هِبَةٍ قَبْلَ عِصْمَةِ النِّكَاحِ فَهُوَ لَهَا وَمَا كَانَ بَعْدَ عِصْمَةِ النِّكَاحِ فَهُوَ لِمَنْ أُعْطِيَهُ أَوْ حُبِيَ وَأَحَقُّ مَا يُكْرَمُ الرَّجُلُ بِهِ ابْنَتُهُ أَوْ أُخْتُهُ " .
IbnMaja
The Chapters on Marriage • Hadith 1955