Hadithcore
Musnad Ahmad, 538
da’if· Darussalam

Umm Ghurab narrated that Bunanah said:

’Uthman never dyed his hair.

حَدَّثَنَا وَكِيعٌ، حَدَّثَتْنِي أُمُّ غُرَابٍ، عَنْ بُنَانَةَ، قَالَتْ مَا خَضَبَ عُثْمَانُ قَطُّ‏.‏

References1 variant
In-Book Reference
Book 4, Hadith 130