Ata (may Allah have mercy on him), the freed slave of Sayyiduna al-Sa'ib bin Yazid (may Allah be pleased with him), states: I saw my master Sayyiduna al-Sa'ib (may Allah be pleased with him); his beard was white and the hair of his head was black. I said: "O my master! Why does the hair of your head not turn white?" He said: "The hair of my head will never turn white," and he related that when the Messenger of Allah (peace and blessings be upon him) passed by, I was a boy playing with the boys. He (peace and blessings be upon him) greeted the boys with salam, and I was among them, so I returned his (peace and blessings be upon him) salam from among the boys. He (peace and blessings be upon him) called me and asked: "What is your name?" I said: "Al-Sa'ib bin Yazid, the son of the sister of Namir." Then he (peace and blessings be upon him) placed his blessed hand on my head and said: 'Baraka Allahu fik' (May Allah bless you). So the place touched by the blessed hand of the Messenger of Allah (peace and blessings be upon him) never turns white.
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Ata, the freed slave of al-Sa'ib, except Ikrimah bin Ammar; al-Nadr bin Muhammad is alone in narrating it, and this report is not narrated from Sayyiduna al-Sa'ib (may Allah be pleased with him) except with this chain."
Hadith Referenceالمعجم الأوسط / باب العين / 4841
Hadith Takhrij«أخرجه الطبراني فى «الكبير» برقم: 6693، والطبراني فى «الصغير» برقم: 701»