From Sahih Bukhari (Hadith 501):
Narrated Abu Juhaifa:Allah's Messenger (ﷺ) came out at midday and offered a two-rak`at Zuhr and `Asr prayers at Al-Batha and a short spear (or stick) was planted in front of him (as a Sutra). He performed ablution and the people took the remaining water left after his ablution and rubbed their bodies with it
Reference: Bukhari 501