From Sahih Bukhari (Hadith 1266):
Narrated Ibn `Abbas:While a man was at `Arafat (for Hajj) with Allah's Messenger (ﷺ), he fell down from his Mount and broke his neck (and died). So Allah's Messenger (ﷺ) said, "Wash him with water and Sidr and shroud him in two pieces of cloth and neither perfume him nor cover his head, for Allah will resurrect him on the Day of Resurrection and he will be saying 'Labbaik
Reference: Bukhari 1266