It was narrated from 'Abdullah bin Buraidah that his father said: "Abu Bakr and 'Umar, may Allah be pleased with them, proposed marriage to Fatimah but the Messenger of Allah said: 'She is young.' Then 'Ali proposed marriage to her and he married her to him."  

خَطَبَ أَبُو بَكْرٍ وَعُمَرُ ؓ فَاطِمَةَ فَقَالَ رَسُولُ اللَّهِ ﷺ إِنَّهَا صَغِيرَةٌ فَخَطَبَهَا عَلِيٌّ فَزَوَّجَهَا مِنْهُ