Mishkat al-Masabih #323
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن عَائِشَة قَالَتْ: كَانَتْ يَدُ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ الْيُمْنَى لِطَهُورِهِ وَطَعَامِهِ وَكَانَتْ يَدُهُ الْيُسْرَى لِخَلَائِهِ وَمَا كَانَ مِنْ أَذًى. رَوَاهُ أَبُو دَاوُد
‘A'isha said, “God’s messenger used his right hand for his ablution water and his food, and his left hand for his evacuations and anything objectionable.”
Abu Dawud transmitted it.
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About Mishkat al-Masabih
This hadith is #323 from Mishkat al-Masabih, in the Book of Purification.