Abdullah bin Jarhad al-Aslami (may Allah have mercy on him) narrated from his father, Sayyiduna Jarhad (may Allah be pleased with him), that he heard the Messenger of Allah (peace and blessings be upon him) say: "The thigh of a Muslim man is part of his awrah."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2136