429 – Abu Musa (may Allah be pleased with him) reported that the Messenger of Allah ﷺ said, “Gold and silk have been made lawful for the women of my community and forbidden for its men.” Recorded by Ahmad, al-Nasa’i, and al-Tirmidhi, who declared it sound (1).

Hadith grading
This narration is hasan (good).
Al-Tirmidhi, al-Nasa’i, and Ahmad all transmitted it; al-Tirmidhi said, “hasan sahih.” Its narrators are trustworthy—among them are transmitters relied upon by al-Bukhari and Muslim—yet the chain is technically broken, for Saʿid ibn Abi Hind never heard anything from Abu Musa, as stated by al-Darqutni, Ibn Hajar, and others. There are supporting reports whose chains are weak, but—as Shaykh al-Albani observes—their sheer number allows them to reinforce one another, so the deficiency is remedied.

Points derived from the hadiths
1 – Hadith 426 establishes the prohibition of silk for men. This restriction is confirmed by other proofs, and the ruling with its qualification is unanimously accepted by the scholars.
2 – An exception is made for a simple trimming whose breadth ranges from two to four fingers; this is unanimously permitted.
3 – The phrase “the width of two, three, or four fingers” is not the narrator’s doubt; it is a legislative statement conveying a choice, similar to the verse on the expiation for harm while in ihram: “then a redemption by fasting, or charity, or sacrifice” (Q 2:196).
4 – Hadith 427 likewise indicates that wearing silk is forbidden for men.