عَنْ أَنَسِ بْنِ مَالِكٍ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((إِنَّ مُوسَى بْنَ عِمْرَانَ كَانَ إِذَا أَرَادَ أَنْ يَدْخُلَ الْمَاءَ لَمْ يُلْقِ ثَوْبَهُ حَتَّى يُوَارِي عَوْرَتَهُ فِي الْمَاءِ))
It is narrated from Sayyiduna Anas bin Malik, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: When Musa bin Imran, peace be upon him, intended to enter the water, he would not remove his garment until he had concealed his private parts in the water.