Sunan Abi Dawud Book 35, Hadith 44

Do not pluck out grey hair. If any believer grows a grey hair in Islam, he will have light on the Day of Resurrection. (This is Sufyan's version). Yahya's version says: Allah will record on his behalf a good deed for it, and will blot out a sin for it.

Previous Hadith

We used to grow beard long except during the Hajj or 'Umrah.

Abu Dawud said: Istihdad means to shave the pubes.

Sunan Abi Dawud Book 35, Hadith 43
Next Hadith

The Prophet (ﷺ) as saying: Jews and Christians do not dye (their beards), so act differently from them.

Sunan Abi Dawud Book 35, Hadith 45