Mishkat al-Masabih #301
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن ابْن عَبَّاس قَالَ: أَكَلَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَتِفًا ثُمَّ مَسَحَ يَده بِمِسْحٍ كَانَ تَحْتَهُ ثُمَّ قَامَ فَصَلَّى. رَوَاهُ أَبُو دَاوُد وَابْن مَاجَه وَأحمد
Ibn ‘Abbas said that God's messenger ate a shoulder, and after wiping his hand with a cloth on which he was sitting, he got up and prayed.
Abu Dawud and Ibn Majah transmitted it.
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About Mishkat al-Masabih
This hadith is #301 from Mishkat al-Masabih, in the Book of Purification.