Sahih al-Bukhari 7476
Sahih al-Bukhari · Book 97: Oneness, Uniqueness of Allah (Tawheed) · (Allah’s) Wish and Will
Narrated Abu Musa:
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 " .
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."