USE THE LEFT HAND TO WASH YOUR PRIVATE PARTS H 729 "The Prophet, praise and peace be upon him, used his right hand to make his ablution and for eating his food. His left hand was used in his toilet and for other similar purposes." R 729 Abu Daud with a chain up to the Mother of Believers, Lady Ayesha, may Allah be pleased with her, who related this.
721- وعنها ، قالت : كَانَتْ يَدُ رسول الله صلى الله عليه وآله وسلم اليُمْنَى لِطُهُورِهِ وَطَعَامِهِ ، وَكَانَتِ الْيُسْرَى لِخَلائِهِ وَمَا كَانَ مِنْ أذَىً . حديث صحيح ، رواه أَبُو داود وغيره بإسنادٍ صحيحٍ .