It wasnarrated that 'Ali said:
"The Prophet (ﷺ) said to me: 'Donotshow your thigh, and do not look at the thigh of anyone, living ordead.'" (DE)
English reference (DE): Vol. 1, Book 6, Hadith 1460 (DE)
Arabic reference (DE): Book 6, Hadith 1527 (DE)