Sayyiduna Abu Juhayfah (may Allah be pleased with him) said: I saw the Messenger of Allah (peace and blessings be upon him) praying Asr at al-Abtah, two rak'ahs, and he (peace and blessings be upon him) had placed a spear in front of himself, between himself and those passing along the road.
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18534