Jami` at-Tirmidhi Book 43, Hadith 94

from his father: "An-Najashi gave the Prophet (ﷺ) two black plain Khuff. So he wore them, then he performed Wudu and wiped over them."

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from his father, from his grandfather who said: "The Messenger of Allah (ﷺ) said: 'Indeed Allah loves to see the results of his favors upon His Slaves.'"

Jami` at-Tirmidhi Book 43, Hadith 93
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from his father, from his grandfather: "The Prophet (ﷺ) prohibited plucking gray hair. And he said: "It is the Muslim's light.'"

Jami` at-Tirmidhi Book 43, Hadith 95