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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
abudawud:4209 – Muḥammad b. ʿUbayd > Ḥammād > Thābit > Anas > Suʾil

He did not dye his hair, but Abu Bakr and 'Umar dyed their hair.  

أبو داود:٤٢٠٩ – حَدَّثَنَا مُحَمَّدُ بْنُ عُبَيْدٍ حَدَّثَنَا حَمَّادٌ عَنْ ثَابِتٍ عَنْ أَنَسٍ أَنَّهُ سُئِلَ

عَنْ خِضَابِ النَّبِيِّ ﷺ فَذَكَرَ أَنَّهُ لَمْ يَخْضِبْ وَلَكِنْ قَدْ خَضَبَ أَبُو بَكْرٍ وَعُمَرُ ؓ