The Prophet (peace and blessings be upon him) said:
"When one of you purifies himself (after relieving himself), let him not purify himself with his right hand; rather, he should clean himself with his left hand."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 322
Hadith Gradingالألبانی:صحيح
Hadith Takhrij[هـ] عن أبي هريرة. صحيح السنن ٦: حم، د, ن, الدارمي حب, وأبو عوانة.