عَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا قَالَ: مَرَّ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ عَلَى رَجُلٍ وَفَخِذُهُ خَارِجَةٌ، فَقَالَ: ((غَطِّ فَخِذَكَ فَإِنَّ فَخِذَ الرَّجُلِ مِنْ عَوْرَتِهِ))
It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) passed by a man whose thigh was exposed (from his clothing). The Prophet (peace and blessings be upon him) said: Cover your thigh, for the thigh of a man is among the parts that must be concealed.