Sahih al-Bukhari 3984
Book 64: Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi) · Narrated by Usaid
Arabic
حَدَّثَنِي عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ الْجُعْفِيُّ، حَدَّثَنَا أَبُو أَحْمَدَ الزُّبَيْرِيُّ، حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ الْغَسِيلِ، عَنْ حَمْزَةَ بْنِ أَبِي أُسَيْدٍ، وَالزُّبَيْرِ بْنِ الْمُنْذِرِ بْنِ أَبِي أُسَيْدٍ، عَنْ أَبِي أُسَيْدٍ ـ رضى الله عنه ـ قَالَ قَالَ لَنَا رَسُولُ اللَّهِ صلى الله عليه وسلم يَوْمَ بَدْرٍ " إِذَا أَكْثَبُوكُمْ فَارْمُوهُمْ وَاسْتَبْقُوا نَبْلَكُمْ ".
English translation
Narrated Usaid:On the day of Badr, Allah's Messenger (ﷺ) said to us, "When the enemy comes near to you, shoot at them but use your arrows sparingly (so that your arrows should not be wasted)
Reference: Sahih al-Bukhari 3984, Book of Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi). English translation by Dr. Muhammad Muhsin Khan.