Jami` at-Tirmidhi 2795
جامع الترمذي#2795SahihNarrated Zur'ah bin Muslim bin Jardah Al-Aslami:about his grandfather Jarhad, he said: "The Prophet (ﷺ) passed by Jarhad in the Masjid and his thigh was exposed, so he said: 'Indeed the thigh is 'Awrah
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan
Zubair Ali ZaiHasan
In-book reference: 39:19