Jami` at-Tirmidhi, Book 43, Hadith 3025 (In-Book) ⓘ
Narrated Zur'ah bin Muslim bin Jardah Al-Aslami: about his grandfather Jarhad, he said: "The Prophet passed by Jarhad in the Masjid and his thigh was exposed, so he said: 'Indeed the thigh is 'Awrah.'"
حَدَّثَنَا ابْنُ أَبِي عُمَرَ، حَدَّثَنَا سُفْيَانُ، عَنْ أَبِي النَّضْرِ، مَوْلَى عُمَرَ بْنِ عُبَيْدِ اللَّهِ عَنْ زُرْعَةَ بْنِ مُسْلِمِ بْنِ جَرْهَدٍ الأَسْلَمِيِّ، عَنْ جَدِّهِ، جَرْهَدٍ قَالَ مَرَّ النَّبِيُّ صلى الله عليه وسلم بِجَرْهَدٍ فِي الْمَسْجِدِ وَقَدِ انْكَشَفَ فَخِذُهُ فَقَالَ " إِنَّ الْفَخِذَ عَوْرَةٌ " . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ مَا أَرَى إِسْنَادَهُ بِمُتَّصِلٍ .
also referenced under: Hadith 2795 (Reference) & Volume 5, Book 41, Hadith 2795 (DarusSalam)