Sunan Abi Dawud Book 35, Hadith 46

Abu Quhafah was brought on the day of the conquest of Mecca with head and beard while like hyssop. The Messenger of Allah (ﷺ) said: Change this something, but avoid black.

Previous 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
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The Prophet (ﷺ) said: The best things with which grey hair are changed are henna and katam.

Sunan Abi Dawud Book 35, Hadith 47