Mishkat al-Masabih 30 Fine Qualities كتاب المناقب 120

وَعَن بُرَيْدَة قَالَ: خطب أبي بَكْرٍ وَعُمَرُ فَاطِمَةَ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِنَّهَا صَغِيرَةٌ» ثُمَّ خَطَبَهَا عليٌّ فزوَّجها مِنْهُ. رَوَاهُ النَّسَائِيّ

Buraida told that Abu Bakr and `Umar asked Fatima’s hand in marriage, but God’s messenger said, “She is young.” Then `Ali asked her hand in marriage and he married her to him. N asa’i transmitted it.