Sahih al-Bukhari
Sahih al-Bukhari 498
Book 8: Prayers (Salat)
Chapter 92 To offer As-Salat (the prayer) using a Harba (a short spear) (as a Sutra)
باب الصَّلاَةِ إِلَى الْحَرْبَةِ
Sahih al-Bukhari 498
Narrated `Abdullah:
The Prophet (ﷺ) used to get a Harba planted in front of him (as a Sutra) and pray behind it.
حَدَّثَنَا مُسَدَّدٌ، قَالَ حَدَّثَنَا يَحْيَى، عَنْ عُبَيْدِ اللَّهِ، أَخْبَرَنِي نَافِعٌ، عَنْ عَبْدِ اللَّهِ، أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ يُرْكَزُ لَهُ الْحَرْبَةُ فَيُصَلِّي إِلَيْهَا.
Hadith text, translations and grading are courtesy of Sunnah.com.