Seeking blessing from the hair of the Prophet (peace and blessings be upon him)

It is narrated from Sayyiduna Abu Ayyub (may Allah be pleased with him) that he removed something (such as a straw) from the blessed beard of the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) said: "O Abu Ayyub! May Allah keep every kind of evil (and everything disliked) away from you."
This hadith has an authentic (sahih) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Ibrahim bin Abdullah bin Hunayn that Sayyiduna Abdullah bin Abbas and Sayyiduna al-Miswar bin Makhramah (may Allah be pleased with them) differed on the question of whether a person in ihram may wash his head with water (for coolness) without being in a state of major ritual impurity (janabah). So they sent me to ask about it of Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him), who was at a place near Makkah. Then he mentioned the hadith at length.
This is a merit of Sayyiduna Abu Ayyub (may Allah be pleased with him), that eminent Companions such as Ibn Abbas and al-Miswar refer to him in a question, and I think that the two Shaykhs, or one of them, have recorded it in the Book of Purification.