Mishkat al-Masabih #1216
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أُمُّ سَلَمَةَ رَضِيَ اللَّهُ عَنْهَا أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «كَانَ يُصَلِّي بَعْدَ الْوِتْرِ رَكْعَتَيْنِ» رَوَاهُ التِّرْمِذِيُّ وَزَادَ ابْنُ مَاجَه: خفيفتين وَهُوَ جَالس
Umm Salama said the Prophet used to pray two rak'as after the witr.
Tirmidhi transmitted it, and Ibn Majah added that they were short ones which he prayed while sitting.
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About Mishkat al-Masabih
This hadith is #1216 from Mishkat al-Masabih, in the Book of Prayer.