The Messenger of Allah ﷺ came to Ali and Fatimah while they were lying under a khamil of theirs. A khamil is a white woolen blanket. The Messenger of Allah ﷺ had provided it for them as part of their household furnishings, along with a pillow stuffed with idhkhir grass and a waterskin.
حدثنا واصل بن عبد الأعلى حدثنا محمد بن فضيل عن عطاء بن السائب عن أبيه
أن رسول الله ﷺ أتى عليا وفاطمة وهما في خميل لهما والخميل القطيفة البيضاء من الصوف قد كان رسول الله ﷺ جهزهما بها ووسادة محشوة إذخرا وقربة
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[Sahih] Nasai narrated it in his chapter on Nikah, on a man providing his daughter's trousseau, no. 3386, from the hadith of Zaida, from Ataa, with this wording. Hammad bin Salama also narrated it, Ibn Saad 8/(25), and others narrated it from Ataa with this chain, in a longer form, and the hadith has corroborating narrations.