Sunan an-Nasai 20068
In-book no 5332أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا حَمَّادٌ، عَنْ أَيُّوبَ، عَنْ أَبِي قِلاَبَةَ، عَنْ سَمُرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " عَلَيْكُمْ بِالْبَيَاضِ مِنَ الثِّيَابِ فَلْيَلْبَسْهَا أَحْيَاؤُكُمْ وَكَفِّنُوا فِيهَا مَوْتَاكُمْ فَإِنَّهَا مِنْ خَيْرِ ثِيَابِكُمْ " .
It was narrated that Samurah said: "The Messenger of Allah said: 'You should wear white garments; dress your living ones in them, and shroud your dead in them, for they are among the best of your garments.'"