Sunan Abi Dawud 4159
سنن أبي داود#4159Da'ifNarrated Abdullah ibn Mughaffal: The Messenger of Allah (ﷺ) forbade combing the hair except every second day
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiDaif
In-book reference: 35:1