The Prophet ﷺ said, "The thigh is part of the awrah."
حدثنا واصل بن عبد الأعلى الكوفي حدثنا يحيى بن آدم عن إسرائيل عن أبي يحيى عن مجاهد
عن النبي ﷺ قال الفخذ عورة
No references are available.
[Hasan]. Ahmad (1/275) also reported it through the hadith of Israil, with this chain, and its chain is daif, but the hadith has corroborating narrations. There is also a narration on this topic from Ali [Abu Dawud, hadith: 4015, 4140] and from Muhammad bin Abdullah bin Jahsh [Ahmad: 5/290].