(12) بَابُ قَوْلِ اللَّهِ تَعَالَى: {وَاذْكُرْ فِي الْكِتَابِ إِسْمَاعِيلَ إِنَّهُ كَانَ صَادِقَ الْوَعْدِ}
Narrated Salama bin Al-Akwa`:
The Prophet (ﷺ) passed by some persons of the tribe of Aslam practicing archery (i.e. the throwing of arrows) Allah's Messenger (ﷺ) said, "O offspring of Ishmael! Practice archery (i.e. arrow throwing) as your father was a great archer (i.e. arrow-thrower). I am with (on the side of) the son of so-and-so-." Hearing that, one of the two teams stopped throwing. Allah's Messenger (ﷺ) asked them, ' Why are you not throwing?" They replied, "O Allah's Messenger (ﷺ)! How shall we throw when you are with the opposite team?" He said, "Throw, for I am with you all."
Reference: Sahih al-Bukhari 3373
In-book reference: Book 60, Hadith 52
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 55, Hadith 592