Dyeing the beard

Abu Aqil says that he saw one of the hairs of the Messenger of Allah (peace and blessings be upon him) dyed with henna. "We used to stir it in water and then drink that water."
And with the same chain it is narrated from Abu Malik that he saw one of the hairs of the Messenger of Allah (peace and blessings be upon him) dyed with henna, and it was not a very deep red. And he said: "All of us used to wash it with water."

Abu Ya'la (may Allah have mercy on him) says: It is narrated from Sayyiduna Anas (may Allah be pleased with him) that a man came to the Messenger of Allah (peace and blessings be upon him) the hair of whose head and beard had turned white. He (peace and blessings be upon him) asked him: "Are you not a Muslim?" He said: "Indeed (I am a Muslim)." He (peace and blessings be upon him) said: "Then dye (your hair)."

It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Dye with henna, for it is fragrant and soothes dizziness."
Imam Abu Ya'la said: "I do not know whether this Sharik is Ibn Abi Namir or someone else."
And al-Bazzar narrated it with his chain through Thumamah, from Sayyiduna Anas (may Allah be pleased with him) as well, with the wording: "Indeed, it (henna) increases your youthfulness and your desire for married life."

Amr bin Shu'ayb (may Allah have mercy on him) narrates from his father, from his grandfather (may Allah be pleased with them both), that the Messenger of Allah (peace and blessings be upon him) said: "Whoever changes the whiteness (of his hair) with (black) dye, Allah Almighty will not look at him (with mercy) on the Day of Resurrection."
According to the hadith scholars, the narrator Muhammad bin Ubaydullah in this report is in fact al-Arzami, who is very weak (unreliable).

Imam al-Tayalisi (may Allah have mercy on him) narrated from Abd al-Jalil bin Atiyyah, from Shahr bin Hawshab, from Sayyiduna Amr bin Abasah (may Allah be pleased with him), that he used to narrate (this) hadith: "The white hairs of old age are light (a source of radiance and honour), except for the one who dyes them (i.e. the white hairs) or plucks them out."
Then (the narrator of the hadith, Abd al-Jalil bin Atiyyah) asked Shahr bin Hawshab: "But people make (their hair) yellow and dye it with henna (so does this ruling apply to that too, that it no longer remains light)?" Shahr bin Hawshab replied: "Yes! It is as if (by this prohibition) black dye is meant."