That the Messenger of Allah (ﷺ) said: "The blessing of the horse is in its redness."

This Hadith is Hasan Gharib, we do not know of it except from this route, from the narration of Shaiban.
Jami` at-Tirmidhi Book 23, Hadith 26
← Previous Hadith That the Messenger of Allah (ﷺ) said: "Goodness will remain in the forelocks of horses until the Day of Judgement: (They bring about) Rewards and spoils of war."

There are narrations on this topic from Ibn 'Umar, Abu Sa'eed, Jarir, Abu Hurairah, Asma' bin Yazid, Al-Mughira bin Shu'bah, and Jabir.

This Hadith is Hasan Sahih. 'Urwah is Ibn Al-Ja'd Al-Bariqi, and they say he is 'Urwah bin Al-Ja'd. Ahmad bin Hanbal said: "The Fiqh of this Hadith is that Jihad is with every Imam until the Day of Judgement."

Jami` at-Tirmidhi Book 23, Hadith 25 Next Hadith → That the Prophet (ﷺ) said: "The best horse is the black one with a spot on the face, and white on the upper lip. Then the one with some white on his lower legs, except for the right. So if it is no black, then the Kumait (red one with black on its ears and its mane) with these markings."

Jami` at-Tirmidhi Book 23, Hadith 27