"The Messenger of Allah said: 'When anyone of you cleans himself, he should not clean himself with his right hand. Let him clean himself with his left hand.'" (Using translation from Ibn Mājah 312)
" إِذَا استطابَ أحدُكم فلا يستطبْ بيمِينه، لِيستَنْجِ بِشمالِه" .