Sunan an-Nasa'i, Volume 6, Book 48, Hadith 5245 (DarusSalam) ⓘ
It was narrated that 'Ubaid said: "I saw Ibn 'Umar dyeing his beard yellow and I asked him about that. 'He said: "I saw the Prophet [SAW] dye his beard yellow."
أَخْبَرَنَا يَحْيَى بْنُ حَكِيمٍ، قَالَ حَدَّثَنَا أَبُو قُتَيْبَةَ، قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ عُبَيْدٍ، قَالَ رَأَيْتُ ابْنَ عُمَرَ يُصَفِّرُ لِحْيَتَهُ فَقُلْتُ لَهُ فِي ذَلِكَ فَقَالَ رَأَيْتُ النَّبِيَّ صلى الله عليه وسلم يُصَفِّرُ لِحْيَتَهُ .
also referenced under: Hadith 5243 (Reference) & Book 48, Hadith 204 (In-Book)