It is narrated from Sayyiduna Jarid that once he was sitting with his thigh uncovered. The Prophet (ﷺ) passed by and the Prophet (ﷺ) said: Cover it, for the thigh is 'awrah (a part that must be covered).
Hadith Referenceمسند احمد / مسند المكيين / 15933
Hadith Gradingحکم دارالسلام:حسن بشواهده، وهذا إسناد ضعيف لاضطرابه