Sunan an-Nasa'i, Hadith 5052 ⓘ
It was narrated that Wa'il bin Hujr said: "I came to the Prophet [SAW] and I had hair. He said: 'This is bad,' and I thought he meant me, so I cut my hair then I came to him. He said to me: 'I didn't mean you, but this is better.'"
أَخْبَرَنَا مَحْمُودُ بْنُ غَيْلاَنَ، قَالَ حَدَّثَنَا سُفْيَانُ، أَخُو قَبِيصَةَ وَمُعَاوِيَةُ بْنُ هِشَامٍ قَالاَ حَدَّثَنَا سُفْيَانُ، قَالَ حَدَّثَنَا عَاصِمُ بْنُ كُلَيْبٍ، عَنْ أَبِيهِ، عَنْ وَائِلِ بْنِ حُجْرٍ، قَالَ أَتَيْتُ النَّبِيَّ صلى الله عليه وسلم وَلِي شَعْرٌ فَقَالَ " ذُبَابٌ " . فَظَنَنْتُ أَنَّهُ يَعْنِينِي فَأَخَذْتُ مِنْ شَعْرِي ثُمَّ أَتَيْتُهُ فَقَالَ لِي " لَمْ أَعْنِكَ وَهَذَا أَحْسَنُ " .
also referenced under: Book 48, Hadith 13 (In-Book) & Volume 6, Book 48, Hadith 5055 (DarusSalam)