From Sahih Bukhari (Hadith 499):
Narrated `Aun bin Abi Juhaifa:that he had heard his father saying, "Allah's Messenger (ﷺ) came to us at midday and water was brought for his ablution. He performed ablution and led us in Zuhr and `Asr prayers with a short spear (or stick) planted in front of him (as a Sutra), while women and donkeys were passing beyond it
Reference: Bukhari 499