Sahih al-Bukhari 7476
Book 97: Oneness, Uniqueness of Allah (Tawheed) · Narrated by Abu Musa
Arabic
حَدَّثَنَا مُحَمَّدُ بْنُ الْعَلاَءِ، حَدَّثَنَا أَبُو أُسَامَةَ، عَنْ بُرَيْدٍ، عَنْ أَبِي بُرْدَةَ، عَنْ أَبِي مُوسَى، قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم إِذَا أَتَاهُ السَّائِلُ ـ وَرُبَّمَا قَالَ جَاءَهُ السَّائِلُ ـ أَوْ صَاحِبُ الْحَاجَةِ قَالَ " اشْفَعُوا فَلْتُؤْجَرُوا، وَيَقْضِي اللَّهُ عَلَى لِسَانِ رَسُولِهِ مَا شَاءَ ".
English translation
Narrated Abu Musa:Whenever a beggar or a person in need of something came to the Prophet (ﷺ) , he used to say (to his companions), "Intercede (for him) and you will be rewarded for that, and Allah will fulfill what He will through His Apostle's tongue
Reference: Sahih al-Bukhari 7476, Book of Oneness, Uniqueness of Allah (Tawheed). English translation by Dr. Muhammad Muhsin Khan.