Riyad as-SalihinChapter 1Hadith 42
Full Sharh — Riyad as-Salihin 42
وعنها قالت: كانت يد رسول الله صلى الله عليه وسلم ، اليمنى لطهوره وطعامه، وكان اليسرى لخلائه وما كان من أذى. حديث صحيح، ((رواه أبو داود وغيره بإسناد صحيح)).
English Translation
'Aishah (May Allah be pleased with her) reported:: Messenger of Allah was used to using his right hand for performing Wudu' and for eating his food whereas he was used to using his left hand in his toilet and for other similar purposes.
Source
Riyad as-Salihin(رياض الصالحين)
The Book of Good Manners
Hadith Number
42