Question 164: A man had his right arm amputated so he uses the left for doing everything, such as Istinjaa’ (cleansing the private parts with water after urination or defecation), Madmadah (rinsing the mouth), and so on. Is doing so permissible? Also, this man cannot wash all the parts of his back when performing Ghusl (full ritual bath). Is it permissible for him to perform Ghusl with the help of his wife?
Answer: The general ruling regarding Istinjaa’ according to Sharee`ah (Islaamic law) is that people use their left hand. However, Madmadah and Istinshaq (sniffing water into the nose and then expelling it) are to be done with the right hand. This is to honor the right hand and protect it from filth. A proof of this is the Hadeeth narrated by `Aa’ishah (may Allaah be pleased with her) who said… read more here.