Muwatta Malik #534
Burials
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كُفِّنَ فِي ثَلاَثَةِ أَثْوَابٍ بِيضٍ سَحُولِيَّةٍ .
About Muwatta Malik
This hadith is #534 from Muwatta Malik, in the Book of Burials.