Sunan an-Nasa'i, Hadith 2557 ⓘ
It was narrated from Mu'awiyah bin Sufyan that the Messenger of Allah said: "A man may come and ask for something, and I refuse until you intercede, so that you will be rewarded." And the Messenger of Allah said: "Intercede and you will be rewarded."
أَخْبَرَنَا هَارُونُ بْنُ سَعِيدٍ، قَالَ أَنْبَأَنَا سُفْيَانُ، عَنْ عَمْرٍو، عَنِ ابْنِ مُنَبِّهٍ، عَنْ أَخِيهِ، عَنْ مُعَاوِيَةَ بْنِ أَبِي سُفْيَانَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِنَّ الرَّجُلَ لَيَسْأَلُنِي الشَّىْءَ فَأَمْنَعُهُ حَتَّى تَشْفَعُوا فِيهِ فَتُؤْجَرُوا " . وَإِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " اشْفَعُوا تُؤْجَرُوا " .
also referenced under: Book 23, Hadith 0 (In-Book) & Volume 3, Book 23, Hadith 2558 (DarusSalam)