It is narrated from the grandson of Sayyiduna Jarhad (may Allah be pleased with him), from his grandfather Jarhad (may Allah be pleased with him), that the Messenger of Allah (peace and blessings be upon him) passed by him while his thigh was uncovered, and the Messenger of Allah (peace and blessings be upon him) said: "O Jarhad, cover your thigh, for the thigh is awrah."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2127