Sunan an-Nasa'i
It was narrated from Ayyub: "I heard Hafsah saying: 'Umm 'Atiyyah said: They tied the hair of the daughter of the Prophet (ﷺ) in three braids."' 'I said: Did they undo it, then make three braids? She said: 'Yes."'
أَخْبَرَنَا يُوسُفُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا حَجَّاجٌ، عَنِ ابْنِ جُرَيْجٍ، قَالَ أَيُّوبُ سَمِعْتُ حَفْصَةَ، تَقُولُ حَدَّثَتْنَا أُمُّ عَطِيَّةَ، أَنَّهُنَّ جَعَلْنَ رَأْسَ ابْنَةِ النَّبِيِّ صلى الله عليه وسلم ثَلاَثَةَ قُرُونٍ . قُلْتُ نَقَضْنَهُ وَجَعَلْنَهُ ثَلاَثَةَ قُرُونٍ قَالَتْ نَعَمْ .
Grade: Sahih (Darussalam)
Reference