"that a man from " He said: 'Yes." He said: "Then what are their colors?" He said: "Red." He said: "Is there a gray one among them?" He said: "Yes, there is a grey one among them." He said: "From where does that come?" He said: "Perhaps it is hereditary." He said: "Then in the same way, perhaps it is his heredity."

This Hadith is Hasan Sahih.
Jami` at-Tirmidhi Book 31, Hadith 4
← Previous Hadith "'Ali delivered a Khutbah for us in which he said: 'Whoever claims that we have some book to read other than Allah's Book and this paper, which include camel's ages and things related to (relatiation for) wounds, then he has lied." And he said in it: "Al-Madinah is sacred, what is between 'Air to Thawr, so whoever introduces in it any innovation or shelters an innovator then upon him is the curse of Allah, the angels, and all people. On the Day of Judgment, Allah will not accept his compulsory nor optional good deeds. And whoever claims someone else to be his father, or claims Wala' for someone other than his Mawali, then upon him is the curse of Allah, the angels, and the people; his compulsory and optional good deeds shall not be accepted. The covenants of the Muslims are one, it covers the rest of them.

This Hadith is Hasan Sahih. Some of them reported it similarly from Al-A'mash, from Ibrahim At-Taimi, from Al-Harith bin Suwaid from 'Ali.

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Jami` at-Tirmidhi Book 31, Hadith 3 Next Hadith → "Don't you see that the Mujazziz looked just now at Zaid bin Harithah and Usamah bin Zaid, and said: 'These feet belong to each other.'"

This Hadith is Hasan Sahih.

Jami` at-Tirmidhi Book 31, Hadith 5