Sunan an-Nasa'i, Hadith 1897 ⓘ
It was narrated from Samurah that the Prophet said: "Wear white clothes for they are purer and better, and shroud your dead in them."'
أَخْبَرَنَا إِسْحَاقُ، قَالَ أَنْبَأَنَا عَبْدُ الرَّزَّاقِ، قَالَ حَدَّثَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، قَالَتْ كُفِّنَ النَّبِيُّ صلى الله عليه وسلم فِي ثَلاَثَةِ أَثْوَابٍ سُحُولِيَّةٍ بِيضٍ .
also referenced under: Book 21, Hadith 80 (In-Book) & Volume 3, Book 21, Hadith 1897 (DarusSalam)